A291287 -id:A291287

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A291286

a(0)=1, a(1)=2, thereafter a(n) = n*a(n-1)+(n-1)*(n-2)*a(n-2).

+10
1

1, 2, 4, 16, 88, 632, 5552, 57824, 695776, 9500128, 145097152, 2451080192, 45373649024, 913400022656, 19865889564928, 464227147597312, 11599471170191872, 308605525316616704, 8709955613991289856, 259922447412719218688, 8177253768239405504512

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

MAPLE

f:=proc(n) option remember;

if n <= 1 then n+1 else

n*f(n-1)+(n-1)*(n-2)*f(n-2); fi; end;

[seq(f(n), n=0..40)];

CROSSREFS

A244430 and A291287 have the same recurrence.

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 27 2017

STATUS

approved

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