A132168 Alternating row sums of triangle A132166 (s1(7)).

1, 20, 295, 3485, 33496, 247799, 1010905, -7422100, -238118825, -3513857515, -38530770320, -329008652665, -1926925302575, -594574697500, 188633380315975, 3451130126965325, 42502627523897800, 406764806549554775, 2912899847916711625

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Formula

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.

Crossrefs

Cf. A132167 (row sums of A132166).

Sequence in context: A271029 A047795 A223956 * A069326 A001708 A016255

Adjacent sequences: A132165 A132166 A132167 * A132169 A132170 A132171

Keyword

sign,easy

Author

Wolfdieter Lang Oct 12 2007

Status

approved