nope, me simple man, count 1 to n the 'deep' way gives 2, 2, 5, 2, 9, 2, 16, 6, 11, 2, 70 ... and that doesn't OEIS-le either. grrmph, W. ----- Original Message ----- From: "Mike Speciner" <speciner@ll.mit.edu> To: "math-fun" <math-fun@mailman.xmission.com> Cc: "Seqfan (E-mail)" <seqfan@ext.jussieu.fr> Sent: Friday, March 11, 2005 11:40 PM Subject: Re: [math-fun] well posed problem? You're not counting the empty subset? --ms wouter meeussen wrote:
of all subsets of the n-th roots of -1, n= 1 to 20, how many add to zero? ?? 0, 1, 1, 3, 1, 6, 1, 11, 4, 8, 1, 50, 1, 10, 9, 107, 1, 240, 1, 316 ?? where are the 'groupies' when you need them?
W.
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