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A282086
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Number of n-element subsets of [n+10] having an even sum.
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2
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1, 5, 30, 146, 511, 1491, 3976, 9752, 21942, 46126, 92252, 176484, 323554, 571802, 980232, 1634776, 2656511, 4217499, 6560554, 10016006, 15024009, 22174581, 32253936, 46282704, 65567164, 91786604, 127089144, 174169352, 236372692, 317866884, 423822512
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: -(x^4-2*x^3+4*x^2-2*x+1) * (x^8-4*x^7+24*x^6-44*x^5+62*x^4-44*x^3 + 24*x^2-4*x+1) / ((x^2+1)^6*(x-1)^11).
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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