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A068040
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Number of subsets of {1,2,3,...,n} that sum to 0 mod 19.
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1
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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
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0,7
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LINKS
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FORMULA
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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
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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