%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