OFFSET
0,2
FORMULA
a(n) = (n+1)*A135862(n).
EXAMPLE
G.f.: A(x) = 1 + 2*x + 9*x^2 + 88*x^3 + 1425*x^4 + 32886*x^5 +...
MATHEMATICA
Table[(Binomial[n^2+n+1, n](n+1))/(n^2+n+1), {n, 0, 20}] (* Harvey P. Dale, Oct 13 2015 *)
PROG
(PARI) {a(n)=binomial(n^2+n+1, n)*(n+1)/(n^2+n+1)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 23 2013
STATUS
approved