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%I M4567 N1944 #16 Jan 14 2023 02:09:20
%S 0,0,8,102,948,7900,62928,491832
%N Colored series-parallel networks.
%D J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 159.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%K nonn,more
%O 1,3
%A _N. J. A. Sloane_