cp's OEIS Frontend

A104032 Unsigned row sums of triangle A104030, which is the matrix inverse of the triangle of pairwise sums of trinomial coefficients.

%I A104032 #7 Feb 03 2013 19:11:10
%S A104032 1,3,13,83,781,10515,194125,4721363,146385805,5636169363,263831355085,
%T A104032 14755901813843,971805538480141,74439152531508243,6561768848473177933,
%U A104032 659527417026466047443,74976638559342869785741
%N A104032 Unsigned row sums of triangle A104030, which is the matrix inverse of the triangle of pairwise sums of trinomial coefficients.
%C A104032 Row sums of triangle A104030 forms negative Genocchi numbers (of first kind)(A001469).
%o A104032 (PARI) {a(n)=if(n<0,0,(sum(k=0,n,abs((matrix(n+2,n+2,m,j,if(m>=j, polcoeff((1+x+x^2)^(m-1)+O(x^(2*j)),2*j-2)+ polcoeff((1+x+x^2)^(m-1)+O(x^(2*j)),2*j-1))))^-1)[n+1,k+1])))}
%Y A104032 Cf. A104030.
%K A104032 nonn
%O A104032 0,2
%A A104032 _Paul D. Hanna_, Feb 26 2005