A105618 Row sums of triangle A105615.

1, 3, 15, 107, 991, 11203, 148879, 2270027, 39041151, 747704963, 15784630159, 364256650027, 9124264794271, 246600188525123, 7153677209063439, 221729176945261067, 7313478624348963391, 255786689421734222083

Offset: 0

Author

Paul D. Hanna, Apr 16 2005

Keywords

• nonn

Crossrefs

Cf. A105615.

Programs

PARI

{a(n)=if(n<0,0,sum(k=0,n,(matrix(n+1,n+1,m,j,if(m>=j,if(m==j,1,if(m==j+1,-2*j, polcoeff(1/sum(i=0,m-j,(2*i)!/i!/2^i*x^i)+O(x^m),m-j)))))^-1)[n+1,k+1]))}