OFFSET
2,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 2..3327
FORMULA
a(n) ~ 5 * 2^(n - 3/2) / sqrt(Pi*n). - Vaclav Kotesovec, Nov 21 2018
MAPLE
a:= proc(n) option remember; `if`(n<4, [0, 2, 3][n],
((25*n^4-130*n^3-17*n^2+810*n-848)*a(n-1)
+(2*(50*n^4-485*n^3+1596*n^2-2049*n+820))*a(n-2)
-(4*(n-4))*(25*n^3-130*n^2+193*n-76)*a(n-3)
)/((25*n^3-205*n^2+528*n-424)*(n+1)))
end:
seq(a(n), n=2..40);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 19 2018
STATUS
approved