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

1, 3, 13, 83, 781, 10515, 194125, 4721363, 146385805, 5636169363, 263831355085, 14755901813843, 971805538480141, 74439152531508243, 6561768848473177933, 659527417026466047443, 74976638559342869785741

Offset: 0

Author

Paul D. Hanna, Feb 26 2005

Keywords

• nonn

Comments

Row sums of triangle A104030 forms negative Genocchi numbers (of first kind)(A001469).

Crossrefs

Cf. A104030.

Programs

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])))}