OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
MAPLE
a := n -> 2^n*binomial(3*n, n): seq(a(n), n=0..16);
MATHEMATICA
Table[2^n (3 n)!/(n! (2 n)!), {n, 0, 20}] (* Vincenzo Librandi, Aug 24 2013 *)
PROG
(Magma) [2^n*Factorial(3*n)/(Factorial(n)*Factorial(2*n)): n in [0..20]]; // Vincenzo Librandi, Aug 24 2013
(PARI) a(n) = 2^n*binomial(3*n, 2*n); \\ Michel Marcus, Mar 06 2022
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Johannes W. Meijer, Aug 22 2013
EXTENSIONS
More terms from Vincenzo Librandi, Aug 24 2013
STATUS
approved