A364088 Number of directed multigraphs with loops containing n edges and an infinite number of vertices modulo isomorphism and reversal of all edge directions.

1, 2, 9, 37, 186, 985, 5953, 38689, 271492, 2016845, 15767277, 128792803, 1094819196, 9652396448, 88040449618, 829019941267, 8044691126159, 80322444793338, 824036583310711, 8675576699596604, 93627696274152013

Offset

0,2

Links

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

MathOverflow, Answer to question on counting directed graphs

Crossrefs

Cf. A052171 (without identifying graphs obtained from each other by reversal of all edge directions).

Sequence in context: A150992 A151310 A000663 * A218942 A218943 A122673

Adjacent sequences: A364085 A364086 A364087 * A364089 A364090 A364091

Keyword

nonn

Author

Saibal Mitra, Jul 04 2023

Status

approved