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

0,2

Links

Table of n, a(n) for n=0..17.

Prog

(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]))}

Crossrefs

Cf. A105615.

Sequence in context: A120016 A349874 A074519 * A120732 A245835 A362354

Adjacent sequences: A105615 A105616 A105617 * A105619 A105620 A105621

Keyword

nonn

Author

Paul D. Hanna, Apr 16 2005

Status

approved