%I A037293
%S A037293 1,2,6,70,12870,601080390,1832624140942590534,
%T A037293 23951146041928082866135587776380551750,
%U A037293 5768658823449206338089748357862286887740211701975162032608436567264518750790
%N A037293 Sum_{i=0}^{2^{n-1}} (2^{n-1} choose i)^2.
%F A037293 Central binomial coefficients for powers of 2: a(n)=A001405[A000079(n)] 
               - Labos E. (labos(AT)ana.sote.hu), Apr 11 2001
%Y A037293 Cf. A001405, A000079.
%Y A037293 Sequence in context: A156458 A136268 A030242 this_sequence A129785 A000896 
               A103527
%Y A037293 Adjacent sequences: A037290 A037291 A037292 this_sequence A037294 A037295 
               A037296
%K A037293 nonn,easy
%O A037293 0,2
%A A037293 John Tromp (tromp(AT)cwi.nl).
%E A037293 More terms from Erich Friedman (erich.friedman(AT)stetson.edu).