cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A054593 Number of disconnected labeled digraphs with n nodes.

Original entry on oeis.org

0, 1, 10, 262, 21496, 6433336, 7566317200, 35247649746352, 648839620390462336, 47230175230392839683456, 13617860445102311268975051520, 15577054031612736747163633737901312
Offset: 1

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Author

Vladeta Jovovic, Apr 15 2000

Keywords

Crossrefs

The unlabeled case is A054590.
Cf. A003027, A053763 (not necessarily connected), A054592.

Formula

a(n) = 2^(n*(n-1)) - A003027(n).
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