A091751 Alternating row sums of array A091747 (generalized Stirling2 array (7,2)).

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

Offset: 1

Author

Wolfdieter Lang, Feb 27 2004

Keywords

• sign
• easy

Comments

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

Crossrefs

Cf. A091749 (row sums of A091747).

Formula

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