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A003026 Number of n-node acyclic digraphs with 2 out-points.
(Formerly M4666)
5

%I M4666

%S 1,9,198,10710,1384335,416990763,286992935964,444374705175516,

%T 1528973599758889005,11573608032229769067465,

%U 191141381932394665770442818,6839625961762363728765713227698

%N Number of n-node acyclic digraphs with 2 out-points.

%D R. W. Robinson, Counting labeled acyclic digraphs, pp. 239-273 of F. Harary, editor, New Directions in the Theory of Graphs. Academic Press, NY, 1973.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%Y Cf. A058876, A003025.

%K nonn

%O 2,2

%A _N. J. A. Sloane_.

%E More terms from _Vladeta Jovovic_, Apr 10 2001

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Last modified September 28 01:27 EDT 2021. Contains 347698 sequences. (Running on oeis4.)