%I A072343
%S A072343 3,28,320,4272,65632,1149312,22712832,501216000,12225264128,
%T A072343 326574262272,9478749110272,296914161754112,9979741990993920,
%U A072343 358151267772203008,13664955628675399680,552220995731872481280
%N A072343 a(n) = 2^(n-1)*sum(k=0,n,(n+k)!/k!^2).
%Y A072343 Sequence in context: A037588 A076723 A026114 this_sequence A151423 A161605 
               A048954
%Y A072343 Adjacent sequences: A072340 A072341 A072342 this_sequence A072344 A072345 
               A072346
%K A072343 easy,nonn
%O A072343 1,1
%A A072343 Benoit Cloitre (benoit7848c(AT)orange.fr), Jul 31 2002