OFFSET
0,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 0..100
FORMULA
Recurrence: (8*n^3 - 34*n^2 + 47*n - 20)*a(n) = (32*n^5 - 120*n^4 + 144*n^3 - 56*n^2 + 7*n + 2)*a(n-1) - 2*(2*n-3)*(32*n^5 - 144*n^4 + 238*n^3 - 161*n^2 + 38*n - 1)*a(n-2) + 4*(n-2)*(2*n-5)*(2*n-3)*(8*n^3 - 10*n^2 + 3*n + 1)*a(n-3). - Vaclav Kotesovec, Dec 29 2013
a(n) ~ 2^(2*n+1/2) * n^n / exp(n). - Vaclav Kotesovec, Dec 29 2013
MATHEMATICA
Table[Sum[(2*n)!/(2*n-j)!, {j, 0, n}], {n, 0, 20}] (* Vaclav Kotesovec, Dec 29 2013 *)
PROG
(PARI) { for (n=0, 100, s=0; for (j=0, n, s+=(2*n)!/(2*n - j)!); write("b066211.txt", n, " ", s) ) } \\ Harry J. Smith, Feb 06 2010
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 17 2001
STATUS
approved