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A350907
Number of unlabeled initially connected digraphs with n arcs.
4
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
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
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 21 2022
STATUS
approved