A340912 Central terms of triangle A340910.

1, 1, 6, 63, 907, 16208, 340458, 8169034, 220494839, 6638599425, 221835477385, 8197807088637, 333879685074774, 14929308189076011, 729701504761143784, 38801435534565069687, 2233844275229192069586, 138592433800490757379259

Offset

0,3

Links

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

Prog

(PARI) {A340910(n, k) = my(A=1); for(i=1, n, A = sum(m=0, n, x^m/(1 - x*y*A^m +x*O(x^n))) ); polcoeff(polcoeff(A, n, x), k, y)}
for(n=0, 20, print1(A340910(2*n, n), ", "))
(PARI) {A340910(n, k) = my(A=1); for(i=1, n, A = sum(m=0, n, x^m*y^m/(1 - x*A^m +x*O(x^n))) ); polcoeff(polcoeff(A, n, x), k, y)}
for(n=0, 20, print1(A340910(2*n, n), ", "))

Crossrefs

Sequence in context: A229451 A132078 A113669 * A121415 A227278 A295267

Adjacent sequences: A340909 A340910 A340911 * A340913 A340914 A340915

Keyword

nonn

Author

Paul D. Hanna, Jan 28 2021

Status

approved