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%I #4 Mar 30 2012 18:57:04
%S 1,5,16,56,203,749,2795,10517,39832,151658,579956,2225964,8570330,
%T 33086030,128028650,496432760,1928418395,7503144365,29235705215,
%U 114064338335,445552419545,1742264571605,6819546853625,26717004445325
%N Rank of (1,1,...,1) (n 1's) when {0,1,2,...}^n is lexicographically ordered.
%F a(n)=C(2n-1, n)+b(n-2)+1, where b=A057552.
%e For n=3, the ordering starts (0,0,0), (0,0,1), ... and the 15th term is (1,1,1).
%K nonn
%O 1,2
%A _Clark Kimberling_, Sep 07 2000
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