A350752 Number of unlabeled strongly connected digraphs with n arcs.
1, 0, 1, 1, 3, 6, 25, 91, 442, 2241, 12591, 75180, 478648, 3211245, 22635956, 166828221, 1281518573, 10229858290, 84652925554, 724601312400, 6403522811765, 58327076550161, 546764617643250, 5267719312771122, 52096218005705959, 528285485054771639
Offset: 0