OFFSET
0,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..50
FORMULA
a(n) = binomial(n(n+1), n(n+1)/2).
a(n) ~ 2^(n^2+n) sqrt(2/Pi) (1/n - 1/(2n^2) + 1/(8n^3) + ...). - Robert Israel, Nov 08 2016
MAPLE
seq(binomial(n*(n+1), n*(n+1)/2), n=0..20); # Robert Israel, Nov 08 2016
MATHEMATICA
Table[Binomial[n*(n + 1), n*(n + 1)/2], {n, 0, 10}] (* G. C. Greubel, Nov 07 2016 *)
PROG
(PARI) a(n)=binomial(n*(n+1), n*(n+1)/2)
(Magma) [Binomial(n*(n+1), n*(n+1) div 2): n in [0..15]]; // Vincenzo Librandi, Nov 08 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul D. Hanna, Dec 02 2007
STATUS
approved