A068040 - OEIS

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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

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OFFSET

0,7

LINKS

Table of n, a(n) for n=0..35.

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

CROSSREFS

19th row of A068009.

Sequence in context: A294533 A294541 A294564 * A200084 A184704 A295963

Adjacent sequences: A068037 A068038 A068039 * A068041 A068042 A068043

KEYWORD

nonn

AUTHOR

Antti Karttunen, Feb 11 2002

STATUS

approved