On 2014-12-07 20:07, Neil Sloane wrote:

you might have referenced http://oeis.org/A001110 and A001109! Best regards Neil

Neil J. A. Sloane, President, OEIS Foundation. 11 South Adelaide Avenue, Highland Park, NJ 08904, USA. Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ. Phone: 732 828 6098; home page: http://NeilSloane.com Email: njasloane@gmail.com

Done. --rwg

On Sun, Dec 7, 2014 at 11:01 PM, Bill Gosper <billgosper@gmail.com> wrote:

...

Something for the youngsters: gosper.org/triangsq.pdf But you might see a Mathematica trick, e.g. --rwg