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

0,6

Links

Table of n, a(n) for n=0..34.

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]

Crossrefs

12th row of A068009.

Sequence in context: A284474 A117075 A024506 * A293337 A293364 A287425

Adjacent sequences: A068030 A068031 A068032 * A068034 A068035 A068036

Keyword

nonn

Author

Antti Karttunen, Feb 11 2002

Status

approved