%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