A068040 Number of subsets of {1,2,3,...,n} that sum to 0 mod 19.

1, 1, 1, 1, 1, 1, 2, 7, 14, 27, 54, 108, 216, 431, 862, 1724, 3450, 6899, 13798, 27596, 55190, 110378, 220754, 441506, 883010, 1766020, 3532046, 7064092, 14128182, 28256364, 56512728, 113025456, 226050910, 452101820, 904203640, 1808407284

Offset: 0

Author

Antti Karttunen, Feb 11 2002

Keywords

• nonn

Crossrefs

19th row of A068009.

Formula

Empirical G.f.: -(2*x^19+x^17-2*x^16+x^13+x^9-3*x^7+x^5+x^4+x^3+x^2+x-1) / ((2*x-1)*(2*x^19-1)). - Colin Barker, Dec 22 2012