%I
%S 0,1,4,9,12,20,30,42,56,72,90,99,120,143,168,195,224,255,288,323,360,
%T 378,418,460,504,550,598,648,700,754,810,868,928,990,1054,1085,1152,
%U 1221,1292,1365,1440,1517,1596,1677,1760,1845,1932,2021,2112
%N Related to number of reachable pairs in a digraph (see Rao article for details).
%D A. R. Rao, The number of reachable pairs in a digraph, Discr. Math., 306 (2006), 15951600.
%H A. R. Rao, <a href="/A119640/b119640.txt">Table of n, a(n) for n = 1..200</a>
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Jul 27 2006
