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A053454 Number of connected digraphs with n arcs. 1
1, 4, 12, 53, 237, 1306, 7537, 47913, 322253, 2297874, 17191216, 134505656, 1095715055, 9267223594, 81162609328, 734511656413, 6856030049629, 65899370570285, 651338242941020, 6611459646337423, 68842439737228261 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

FORMULA

Inverse Euler transform of A053418. [From Max Alekseyev, Jan 22 2010]

CROSSREFS

Cf. A003085, A053418.

Sequence in context: A180381 A149413 A149414 * A149415 A149416 A149417

Adjacent sequences:  A053451 A053452 A053453 * A053455 A053456 A053457

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jan 12 2000

EXTENSIONS

Extended by Max Alekseyev, Jan 22 2010

STATUS

approved

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Last modified November 18 13:22 EST 2018. Contains 317306 sequences. (Running on oeis4.)