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%I #8 Jan 13 2020 13:55:04
%S 0,2,4,9,14,22,28,44,52,67,84,97,117,139,163,189,206,235,266,299,334,
%T 371,410,451,478,522,568,616,666,718,748,803,860,919,980,1043,1108,
%U 1175,1244,1315,1388,1463,1540,1619,1700,1783,1838,1924,2012
%N Related to number of reachable pairs in a digraph (see Rao article for details).
%H A. R. Rao, <a href="/A119637/b119637.txt">Table of n, a(n) for n = 1..200</a>
%H A. R. Rao, <a href="https://doi.org/10.1016/j.disc.2004.03.022">The number of reachable pairs in a digraph</a>, Discr. Math., 306 (2006), 1595-1600.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Jul 27 2006
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