%I A001257
%S A001257 1,1,4,16,81,400,2304,13225,81796,516961,3392964,22714756,
%T A001257 155900196,1087218729,7710771721,55404215161,403030713409,
%U A001257 2962388303281,21983682632976,164512124707984,1240577449436224
%N A001257 Squares of numbers of rooted trees.
%H A001257 <a href="Sindx_Ro.html#rooted">Index entries for sequences related to 
               rooted trees</a>
%Y A001257 Cf. A000081.
%Y A001257 Sequence in context: A003471 A002777 A118997 this_sequence A133053 A110378 
               A076997
%Y A001257 Adjacent sequences: A001254 A001255 A001256 this_sequence A001258 A001259 
               A001260
%K A001257 nonn
%O A001257 0,3
%A A001257 N. J. A. Sloane (njas(AT)research.att.com).