A054768 a(n+2) = (2n+3)*a(n+1) + (n+1)^2*a(n).

-2, 1, 1, 9, 72, 792, 10512, 165168, 2992608, 61445088, 1409857920, 35751525120, 992877886080, 29970166769280, 976990865518080, 34206887786803200, 1280236466132467200, 51004766655793036800, 2155155171665039308800

Offset

0,1

Links

Table of n, a(n) for n=0..18.

K. S. Brown, Integer Sequences Related To Pi

Mathematica

RecurrenceTable[{a[0]==-2, a[1]==1, a[n+2]==(2n+3)a[n+1]+(n+1)^2 a[n]}, a, {n, 20}] (* Harvey P. Dale, Dec 31 2017 *)

Crossrefs

Sequence in context: A327088 A376860 A256168 * A104251 A320576 A348455

Adjacent sequences: A054765 A054766 A054767 * A054769 A054770 A054771

Keyword

sign,easy

Author

N. J. A. Sloane, May 26 2000

Extensions

More terms from James Sellers, May 27 2000

Status

approved