A068033 Number of subsets of {1,2,3,...,n} that sum to 0 mod 12.

1, 1, 1, 1, 1, 3, 6, 11, 22, 44, 86, 172, 344, 684, 1368, 2736, 5464, 10928, 21856, 43696, 87392, 174784, 349536, 699072, 1398144, 2796224, 5592448, 11184896, 22369664, 44739328, 89478656, 178957056, 357914112, 715828224, 1431655936

Offset: 0

Author

Antti Karttunen, Feb 11 2002

Keywords

• nonn

Crossrefs

12th row of A068009.

Formula

Empirical G.f.: -(2*x^8-x^7-2*x^6-3*x^5-x^4+3*x^3+x^2+x-1) / ((2*x-1)*(2*x^3-1)). [Colin Barker, Dec 22 2012]