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

Offset: 2

Author

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

Keywords

• nonn

Crossrefs

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

Extensions

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