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A054957 Number of labeled connected Eulerian digraphs with n nodes. 3
1, 1, 6, 118, 7000, 1329496, 868255024, 2039295163312, 17639804273910144, 569596637165777524096, 69273803156588266525129984, 31940576331984155835757999795456, 56121305700570450429977355284230355968, 377361653292638108206937443603065676106341376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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.

FORMULA

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

CROSSREFS

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

Sequence in context: A100070 A135869 A218713 * A271648 A290341 A246827

Adjacent sequences:  A054954 A054955 A054956 * A054958 A054959 A054960

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 24 2000

EXTENSIONS

More terms from Vladeta Jovovic, Mar 06 2001

More terms from Alois P. Heinz, Apr 14 2017

STATUS

approved

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Last modified February 22 12:00 EST 2020. Contains 332135 sequences. (Running on oeis4.)