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%I #16 Jan 16 2017 02:30:46
%S 1,2,15,1140,916895,8137369800,850423134076516,1105964895591808388136,
%T 18627853605123584223921210120,4180709311038401636820646431913319660,
%U 12767818425644517198178541333546326811326975100
%N a(n) = binomial(binomial(2*n,n),n).
%H Robert Israel, <a href="/A068409/b068409.txt">Table of n, a(n) for n = 0..42</a>
%p f:= n -> binomial(binomial(2*n,n),n):
%p map(f, [$0..12]); # _Robert Israel_, Jan 15 2017
%o (PARI) a(n)=binomial(binomial(2*n,n),n)
%Y Cf. A000984.
%K nonn
%O 0,2
%A _Reinhard Zumkeller_, Mar 05 2002
%E Edited by _N. J. A. Sloane_ at the suggestion of _Vladeta Jovovic_, Apr 14 2008
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