A350907 Number of unlabeled initially connected digraphs with n arcs.

1, 1, 3, 8, 29, 111, 522, 2604, 14459, 85796, 544753, 3659313, 25902251, 192171887, 1489090036, 12011329453, 100583184087, 872346402439, 7819597099285, 72313198682817, 688784601395670, 6747614973580663, 67896777481378196, 700913648767703716, 7415270780191604414, 80316990564932960558

Offset

0,3

Links

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

Prog

(PARI) A350907seq(15) \\ See PARI link in A350794 for program code.

Crossrefs

Column sums of A057277.

Cf. A051421 (by vertices), A350752, A350796, A350798, A350906.

Sequence in context: A338306 A148876 A245889 * A013309 A058378 A063839

Adjacent sequences: A350904 A350905 A350906 * A350908 A350909 A350910

Keyword

nonn

Author

Andrew Howroyd, Jan 21 2022

Status

approved