A090354 Self-convolution equals the binomial transform of A090353: A^2 = BINOMIAL(A090353).

1, 1, 3, 19, 190, 2574, 43922, 903986, 21784659, 601478195, 18715354049, 647834803569, 24688869993252, 1027073272425876, 46309250293477020, 2249435671825385244, 117101538463333719891, 6503918951175618656403

Offset

0,3

Comments

See comments in A090353.

Links

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

Prog

(PARI) {a(n)=local(A); if(n<1, 0, A=1+x+x*O(x^n); for(k=1, n, B=subst(A^3, x, x/(1-x))/(1-x)+x*O(x^n); A=A-A^4+B); B=subst(A, x, x/(1-x))/(1-x)+x*O(x^n); polcoeff(B^(1/2), n, x))}

Crossrefs

Cf. A090353, A090355.

Sequence in context: A052888 A141623 A229234 * A119394 A101481 A155805

Adjacent sequences: A090351 A090352 A090353 * A090355 A090356 A090357

Keyword

nonn

Author

Paul D. Hanna, Nov 26 2003

Status

approved