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Alternating row sums of array A091746 (generalized Stirling2 array (6,2)).
1

%I #3 Oct 12 2012 14:40:20

%S 1,19,1171,151681,33743041,11461272931,5499378001699,3524209981309921,

%T 2887597622445729121,2916075074262560119891,3507033649107862877516371,

%U 4836904652902464306386484769,7251193844710136332044143616481

%N Alternating row sums of array A091746 (generalized Stirling2 array (6,2)).

%C The first negative term is the 41 digit number a(16)=-42686874251433290891296448926053802610879.

%F a(n)=sum(A091746(n, k)*(-1)^k, k=2..2*n), n>=1.

%Y Cf. A091748 (row sums of A091746).

%K sign,easy

%O 1,2

%A _Wolfdieter Lang_, Feb 27 2004