A357544 Central terms of triangle A357540: a(n) = A357540(2*n,n).

1, 800, 500121600, 6333406238720000, 588750579021316096000000, 243397196351152229173100544000000, 331908261581281694863434866648678400000000, 1223826698292228823742554320600270140080128000000000, 10588007775487579454220040763957899854099800653824000000000000

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Prog

(PARI) {A357540(n, k) = my(S = serreverse( intformal( 1/((1 + x^3)^2*(1 + r^3*x^3)^2 +O(x^(3*n+3)) )^(1/3) )) );
(3*n+1)!*polcoeff( polcoeff(S, 3*n+1, x), 3*k, r)}
for(n=0, 15, print1( A357540(2*n, n), ", "));

Crossrefs

Cf. A357540.

Sequence in context: A035757 A023100 A107553 * A031897 A325380 A259949

Adjacent sequences: A357541 A357542 A357543 * A357545 A357546 A357547

Keyword

nonn

Author

Paul D. Hanna, Oct 10 2022

Status

approved