A024501 - OEIS

%I #10 Dec 25 2022 14:05:13

%S 1,1,2,4,7,11,20,33,57,96,162,274,462,780,1317,2223,3751,6329,10680,

%T 18021,30409,51312,86584,146103,246538,416013,701993,1184566,1998882,

%U 3372999,5691754,9604549,16207222,27348969,46150243,77876717,131414064

%N a(n) = floor(C(4n,2n)/C(4n,n)).

%F a(n) = floor(C(4n,2n)/C(4n/n)) = floor(C(3n,n)/C(2n,n)). - _Clark Kimberling_, Dec 23 2022

%t Floor[Table[Binomial[4n, 2n]/Binomial[4n, n], {n, 0, 40}]] (* _Clark Kimberling_, Dec 22 2022 *)

%Y Cf. A000984.

%K nonn

%O 0,3

%A _Clark Kimberling_

%E More terms from _James A. Sellers_, Feb 06 2000