A020550 4th Fibonacci polynomial evaluated at x=n!.

3, 3, 12, 228, 13872, 1728240, 373249440, 128024074080, 65548320848640, 47784725840597760, 47784725839879257600, 63601470092869711833600, 109903340320478725054003200, 241457638684091756851366041600, 662559760549147780766148884582400, 2236139191853373760085166647348736000

Offset

0,1

Links

Paolo Xausa, Table of n, a(n) for n = 0..181

Formula

a(n) = (n!)^3 + 2*n!. - Christian Krause, Jun 08 2026

Maple

with (combinat):seq(fibonacci(4, n!), n=0..13); # Zerinvary Lajos, Apr 21 2008

Mathematica

Fibonacci[4, Range[0, 15]!] (* Paolo Xausa, Jun 18 2026 *)

Crossrefs

Sequence in context: A382334 A076509 A206704 * A368960 A306529 A200921

Adjacent sequences: A020547 A020548 A020549 * A020551 A020552 A020553

Keyword

nonn

Author

Simon Plouffe

Extensions

a(14)-a(15) from Christian Krause, Jun 08 2026

Status

approved