A363163 Number of directed multigraphs without loops containing n edges and an infinite number of vertices modulo isomorphism and reversal of all edge directions.

1, 1, 5, 17, 83, 394, 2278, 13949, 93898, 670003, 5059914, 40033149, 330555726, 2836763749, 25233047351, 232080785282, 2202802051834, 21539083861802, 216638327167235, 2238260395921444, 23725940481578999

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Crossrefs

Cf. A364088 (with loops).

Sequence in context: A149754 A149755 A365878 * A002020 A038183 A149756

Adjacent sequences: A363160 A363161 A363162 * A363164 A363165 A363166

Keyword

nonn

Author

Saibal Mitra, Jul 07 2023

Status

approved