A350906 - OEIS

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A350906

Number of unlabeled initially-finally connected digraphs with n arcs.

1, 1, 2, 5, 16, 56, 241, 1111, 5748, 31912, 190328, 1204317, 8050341, 56516303, 415128256, 3179020729, 25308005049, 208918893640, 1784451646305, 15739926014382, 143130061546156, 1339761466105929, 12891329514544223, 127351374611721837, 1290198076415425548, 13390893744153374776

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

PROG

(PARI) A350906seq(15) \\ See PARI link in A350794 for program code.

CROSSREFS

Column sums of A057278.

Cf. A049531 (by vertices), A350752, A350796, A350798, A350907.

Sequence in context: A352905 A052815 A195931 * A082789 A234278 A180678

Adjacent sequences: A350903 A350904 A350905 * A350907 A350908 A350909

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Jan 21 2022

STATUS

approved