%I A010053
%S A010053 1,12,2560,2903040,10701766656,98099527680000,1888892391260160000,
%T A010053 68028459471234662400000,4210629057689788455321600000,
%U A010053 419914246162041071241548267520000
%N A010053 4^n*(2*n+1)!*(n!)^2/(n+1).
%p A010053 4^n*(2*n+1)!*(n!)^2/(n+1);
%Y A010053 Sequence in context: A005249 A129206 A135398 this_sequence A092299 A006272 
               A111237
%Y A010053 Adjacent sequences: A010050 A010051 A010052 this_sequence A010054 A010055 
               A010056
%K A010053 nonn,easy
%O A010053 0,2
%A A010053 Joe Keane (jgk(AT)jgk.org)