A111545 Column 1 of triangle A111544.

1, 2, 9, 57, 441, 3933, 39249, 430677, 5137641, 66103533, 911973249, 13428837477, 210259505241, 3489291147933, 61200522593649, 1131630622515477, 22007781151434441, 449197758198576333, 9603342828706622049

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Prog

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

Crossrefs

Cf. A111544.

Sequence in context: A175900 A175912 A218824 * A070075 A124405 A300343

Adjacent sequences: A111542 A111543 A111544 * A111546 A111547 A111548

Keyword

nonn

Author

Paul D. Hanna, Aug 07 2005

Status

approved