The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

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