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%I #5 Mar 30 2013 04:53:35
%S 0,2,4,9,22,45,120,239
%N Sequence t_n arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition).
%D Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.
%F See Quaintance reference for generating functions that produce A129872-A129886.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, May 26 2007
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