%I #16 Feb 02 2022 00:08:45
%S 1,1,1,1,4,9,36,121,529,2209,11236,55225,303601,1692601,9979281,
%T 59923081,373262400,2364779641,15343033689,101095382025,677435994225,
%U 4598901695025,31626631547536,219871778549476,1544481904210609,10948878748872100,78284374662902500
%N Squares of numbers of trees.
%H Alois P. Heinz, <a href="/A001256/b001256.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Tra#trees">Index entries for sequences related to trees</a>
%F a(n) = A000055(n)^2.
%Y Cf. A000055.
%K nonn
%O 0,5
%A _N. J. A. Sloane_