OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
FORMULA
a(n) ~ c*sqrt(n)*4^n, with c = 8/sqrt(Pi) = 2*A249521. - Stefano Spezia, Oct 19 2023
MATHEMATICA
Table[n*(n^2+4*n+1)*Binomial[2*n+3, n]/((n+4)*(n+5)), {n, 0, 20}] (* Vaclav Kotesovec, Oct 27 2012 *)
PROG
(Magma) [n*(n^2+4*n+1)*Binomial(2*n+3, n)/((n+4)*(n+5)): n in [0..25]]; // Vincenzo Librandi, May 04 2013
(PARI) a(n)=n*(n^2+4*n+1)*binomial(2*n+3, n)/((n+4)*(n+5)); \\ Joerg Arndt, May 04 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Corrected and extended by N. J. A. Sloane, Apr 21 2000
STATUS
approved