A054957 Number of labeled connected Eulerian digraphs with n nodes.

1, 1, 6, 118, 7000, 1329496, 868255024, 2039295163312, 17639804273910144, 569596637165777524096, 69273803156588266525129984, 31940576331984155835757999795456, 56121305700570450429977355284230355968, 377361653292638108206937443603065676106341376

Offset: 1

Author

N. J. A. Sloane, May 24 2000

Keywords

• nonn
• easy

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..16
• V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.

Crossrefs

Cf. A058338, A054955, A007080 (EXP-transform), A054959, A054956, A058337, A054958.

Formula

a(n) = A054958(n) + A054959(n). - R. J. Mathar, Apr 13 2017

Extensions

More terms from Vladeta Jovovic, Mar 06 2001

More terms from Alois P. Heinz, Apr 14 2017