A060335 Number of n-node labeled acyclic digraphs with 3 out-points.

1, 28, 1610, 211820, 64144675, 44218682312, 68501035223124, 235728863806525320, 1784437537982029455525, 29470895991194487015464740, 1054563682428338672254476697886, 81276604641664521211218527866093204

Offset

3,2

References

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.

Links

Andrew Howroyd, Table of n, a(n) for n = 3..50

Prog

(PARI) \\ requires A058876.
my(T=A058876(20)); vector(#T-2, n, T[n+2][3]) \\ Andrew Howroyd, Dec 27 2021

Crossrefs

A diagonal of A058876.

Cf. A003025, A003026.

Sequence in context: A042512 A285029 A163033 * A335371 A335370 A335368

Adjacent sequences: A060332 A060333 A060334 * A060336 A060337 A060338

Keyword

nonn

Author

Vladeta Jovovic, Apr 10 2001

Status

approved