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A054590 Number of disconnected digraphs with n unlabeled nodes. 2
0, 1, 3, 19, 244, 10101, 1562298, 885237542, 1795141933300, 13031553571814674, 341286507770733602176, 32523592049568306757117737, 11366810480400463340177768296746, 14669108426561606778443288692015619955, 70315685953531425166863071956073529852161120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..50

FORMULA

a(n) = A000273(n) - A003085(n).

CROSSREFS

The labeled case is A054593.

Cf. A000273, A000719, A003085.

Sequence in context: A135754 A340225 A118023 * A261495 A069344 A305562

Adjacent sequences: A054587 A054588 A054589 * A054591 A054592 A054593

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Apr 14 2000

EXTENSIONS

Terms a(14) and beyond from Andrew Howroyd, Apr 18 2021

STATUS

approved

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Last modified December 6 01:03 EST 2022. Contains 358594 sequences. (Running on oeis4.)