A070894 - OEIS

A070894

Number of nonempty subsets of the set of vertices of a regular n-gon in the plane such that their center of gravity is the center of the polygon.

1, 1, 3, 1, 9, 1, 15, 7, 33, 1, 99, 1, 129, 37, 255, 1, 999, 1, 1155, 133, 2049, 1, 9999, 31, 8193, 511, 16899, 1, 146853, 1, 65535, 2053, 131073, 157, 999999, 1, 524289, 8197, 1336335, 1, 11680389, 1, 4202499, 54871, 8388609, 1, 99999999, 127, 45435423, 131077

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OFFSET

2,3

LINKS

Table of n, a(n) for n=2..51.

CROSSREFS

This is A103314(n) - 1: see that entry for much more information.

Sequence in context: A331732 A197259 A200006 * A090261 A303552 A130599

Adjacent sequences: A070891 A070892 A070893 * A070895 A070896 A070897

KEYWORD

nonn

AUTHOR

Sharon Sela (sharonsela(AT)hotmail.com), May 24 2002

EXTENSIONS

Edited by N. J. A. Sloane Jan 19 2008 at the suggestion of Max Alekseyev and M. F. Hasler.

STATUS

approved