A091751 - OEIS

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A091751

Alternating row sums of array A091747 (generalized Stirling2 array (7,2)).

1

1, 29, 2899, 625381, 235735025, 137662456849, 115219635641083, 130892567494940777, 193870813073375001313, 362981045220391075931461, 838251579579056365127865923, 2340586894706172958195272669517, 7772441664087128321443493161452817

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OFFSET

1,2

COMMENTS

The first negative term is the 159 digit number a(43)=-2116278545846...33655549.

LINKS

Table of n, a(n) for n=1..13.

FORMULA

a(n)=sum(A091747(n, k)*(-1)^k, k=2..2*n), n>=1.

CROSSREFS

Cf. A091749 (row sums of A091747).

Sequence in context: A281440 A171720 A305138 * A144233 A125074 A033519

Adjacent sequences: A091748 A091749 A091750 * A091752 A091753 A091754

KEYWORD

sign,easy

AUTHOR

Wolfdieter Lang, Feb 27 2004

STATUS

approved