OFFSET
5,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 5..750
FORMULA
Recurrence: (n-3)*(n-2)*(n-1)*n*(n+1)*a(n) = 30*(n-3)*(n-2)*(n-1)*n*(2*n - 1)*a(n-1) - 340*(n-3)*(n-2)*(n-1)*(2*n - 3)*(2*n - 1)*a(n-2) + 1800*(n-3)*(n-2)*(2*n - 5)*(2*n - 3)*(2*n - 1)*a(n-3) - 4384*(n-3)*(2*n - 7)*(2*n - 5)*(2*n - 3)*(2*n - 1)*a(n-4) + 3840*(2*n - 9)*(2*n - 7)*(2*n - 5)*(2*n - 3)*(2*n - 1)*a(n-5). - Vaclav Kotesovec, Jun 01 2015
a(n) ~ 20^n / (120*sqrt(Pi)*n^(3/2)). - Vaclav Kotesovec, Jun 01 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 28 2015
STATUS
approved