Warren, I'm sorry you had problems using the new wiki version of the OEIS. I hope that by now we have worked out the bugs in the system. Your login name is Warren D. Smith. Go to http://oeis.org/ and click login in the upper right corner. If you have forgotten your password, you can request a new one, which will be sent to the address on file (which is your gmail address). It is really better if you enter updates yourself, rather than posting them to math fun and hoping that someone else will enter them! Neil PS In case of problems using the OEIS, there are 3 people who can help: Russ Cox, David Applegate and myself On Sun, Aug 26, 2012 at 10:33 PM, Warren Smith <warren.wds@gmail.com> wrote:

Neil Sloane wanted to know which terms I was "sure of".

Well, until I have a rigorous bound for accumulated roundoff error, which I do not, I'm not sure of any term.

However, the reason I printed those terms with both integer and float forms, was to enable the reader to estimate how much roundoff error there is. (Such an estimate is not 100% certain, sorry.)

I think every determinant of an NxN sign matrix, N<=26, should be exact. I think every number I gave, no matter how large the matrix, ought to be good for 9 significant figures (Sloane may not like approximate answers, but he can get them if he wants).

[I stopped trying to enter numbers into the OEIS myself quite a while ago because it was just too damn annoying to use, and plus to add insult to injury it had blown away my login account but nevertheless insisted I use it.]

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-- Dear Friends, I have now retired from AT&T. New coordinates: Neil J. A. Sloane, President, OEIS Foundation 11 South Adelaide Avenue, Highland Park, NJ 08904, USA Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com