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A054768 a[n+2] = (2n+3) a[n+1] + (n+1)^2 a[n]. 0

%I

%S -2,1,1,9,72,792,10512,165168,2992608,61445088,1409857920,35751525120,

%T 992877886080,29970166769280,976990865518080,34206887786803200,

%U 1280236466132467200,51004766655793036800,2155155171665039308800

%N a[n+2] = (2n+3) a[n+1] + (n+1)^2 a[n].

%H K. S. Brown, <a href="http://www.mathpages.com/home/kmath381.htm">Integer Sequences Related To PI</a>

%t 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 *)

%K sign,easy

%O 0,1

%A _N. J. A. Sloane_, May 26 2000

%E More terms from _James A. Sellers_, May 27 2000

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Last modified February 21 14:36 EST 2018. Contains 299414 sequences. (Running on oeis4.)