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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.

A051421 Number of digraphs on n unlabeled nodes with a sink (or, with a source).

Table of values

n a(n)
1 1
2 2
3 12
4 185
5 8990
6 1505939
7 875542491
8 1789247738400
9 13018820342147705
10 341188114831706152794
11 32520852428719860881939391
12 11366533535523591133597276823755
13 14669006027884671703581740693080811331
14 70315546525961698601351615055416574931833334

List of values

[1, 2, 12, 185, 8990, 1505939, 875542491, 1789247738400, 13018820342147705, 341188114831706152794, 32520852428719860881939391, 11366533535523591133597276823755, 14669006027884671703581740693080811331, 70315546525961698601351615055416574931833334]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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