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A132168
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Alternating row sums of triangle A132166 (s1(7)).
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2
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1, 20, 295, 3485, 33496, 247799, 1010905, -7422100, -238118825, -3513857515, -38530770320, -329008652665, -1926925302575, -594574697500, 188633380315975, 3451130126965325, 42502627523897800, 406764806549554775, 2912899847916711625
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n)=sum(A132166(n,m)*(-1)^(m-1),m=1..n), n>=1.
O.g.f.: g(x)/(1+g(x)) with g(x)=(1-(1-6*x)^6)/(36*(1-6*x)^6), o.g.f. first column of A132166.
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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