A068032 Number of subsets of {1,2,3,...,n} that sum to 0 mod 11.

1, 1, 1, 1, 1, 3, 6, 12, 24, 47, 94, 188, 374, 746, 1490, 2978, 5958, 11916, 23832, 47664, 95326, 190652, 381304, 762604, 1525204, 3050404, 6100804, 12201612, 24403224, 48806448, 97612896, 195225788, 390451576, 780903152, 1561806296

Offset: 0

Author

Antti Karttunen, Feb 11 2002

Keywords

• nonn

Crossrefs

11th row of A068009.

Formula

Empirical G.f.: -(2*x^11+x^9-x^5+x^4+x^3+x^2+x-1) / ((2*x-1)*(2*x^11-1)). [Colin Barker, Dec 22 2012]