A111558 Row sums of triangle A111553.

1, 2, 9, 60, 509, 5034, 55689, 674624, 8838189, 124199454, 1861297049, 29618273604, 498716980989, 8860512190034, 165694162575369, 3254269731689064, 66994569450549869, 1443024570035017254

Offset

0,2

Links

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

Prog

(PARI) {a(n)=if(n<0, 0, sum(k=1, n+1, (matrix(n+k, n+k, m, j, if(m==j, 1, if(m==j+1, -m+1, -(m-j-1)*polcoeff(log(sum(i=0, m, (i+3)!/3!*x^i)), m-j-1))))^-1)[n+1, k]))}

Crossrefs

Cf. A111553.

Sequence in context: A357683 A120970 A339360 * A322943 A168449 A001193

Adjacent sequences: A111555 A111556 A111557 * A111559 A111560 A111561

Keyword

nonn

Author

Paul D. Hanna, Aug 07 2005

Status

approved