A098431 - OEIS

A098431

Constant terms of polynomials in A098277.

1, 2, 12, 168, 4272, 171168, 9915072, 783454848, 80965577472, 10599312542208, 1714108476337152, 335566486059952128, 78206210287187177472, 21396344618478777704448, 6790389880757556630700032, 2474264427361959296151748608, 1025915575875578192692958134272, 480265765138533024275849730981888

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OFFSET

0,2

LINKS

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

FORMULA

G.f.: 1/G(0) where G(k) = 1 - x*(2*k+1)*(2*k+2)/(1 - (2*k+2)^2*x/G(k+1)); (continued fraction, 2-step). - Sergei N. Gladkovskii, Aug 11 2012

a(n) = A098277(n, n). - Michel Marcus, Oct 22 2025

CROSSREFS

Cf. A098277.

Sequence in context: A255163 A052728 A052729 * A231085 A059522 A271857

Adjacent sequences: A098428 A098429 A098430 * A098432 A098433 A098434