OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..300
FORMULA
For n>0, a(n) = (n^2+n+1)*(2*n)!/((n+2)*n!). - Vaclav Kotesovec, Oct 18 2013
MAPLE
a:= proc(n) option remember; `if`(n<2, 1+n,
2*(2*n-1)*(n+1)*(n^2+n+1)*a(n-1)/((n+2)*(n^2-n+1)))
end:
seq(a(n), n=0..25);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 17 2013
STATUS
approved