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Sequence i_{t_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n = A129876, t_n = A129875.
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%I #5 Mar 30 2013 04:51:42

%S 0,2,4,4,12,18,56,72

%N Sequence i_{t_n} arising in enumeration of arrays of directed blocks (see Quaintance reference for precise definition), where i_n = A129876, t_n = A129875.

%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