%I A052144
%S A052144 1,4,100,3136,119716,5071504,230553856,11016601600,546360462244,
%T A052144 27888242788624,1456587070867600,77515424509446400,4189899499315360000,
%U A052144 229472379264509977600,12709952101698593689600,710863065714510068187136
%N A052144 A000172(n)^2.
%D A052144 R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see 
               page 191.
%Y A052144 Sequence in context: A091268 A017090 A029995 this_sequence A127776 A059105 
               A129435
%Y A052144 Adjacent sequences: A052141 A052142 A052143 this_sequence A052145 A052146 
               A052147
%K A052144 nonn
%O A052144 0,2
%A A052144 N. J. A. Sloane (njas(AT)research.att.com), Jan 23 2000