OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
a(n) ~ exp(2*n + 4) * n^(2*n + 3/2) / (sqrt(Pi) * 2^(2*n + 3)). - Vaclav Kotesovec, Mar 04 2018
MATHEMATICA
Table[Binomial[(n+2)(n+1), (n+1)n], {n, 0, 20}] (* Harvey P. Dale, Nov 27 2016 *)
PROG
(Sage) [binomial(n*(n+1), 2*n) for n in range(1, 14)] # Zerinvary Lajos, Jun 01 2009
(Magma) [Binomial((n+2)*(n+1), (n+1)*n): n in [0..20]]; // Vincenzo Librandi, Mar 04 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Apr 13 2008
STATUS
approved