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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.

A121936 Number of digraphs with labeled vertices and labeled arcs, with n arcs and with no vertex of indegree 0 or outdegree 0.

Table of values

n a(n)
0 1
1 0
2 2
3 18
4 518
5 23610
6 1600982
7 150451098
8 18694217558
9 2966151496410
10 584994048653462
11 140357794553191578
12 40253455215544778198
13 13598018000464234802010
14 5343837921922909297592342

List of values

[1, 0, 2, 18, 518, 23610, 1600982, 150451098, 18694217558, 2966151496410, 584994048653462, 140357794553191578, 40253455215544778198, 13598018000464234802010, 5343837921922909297592342]

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

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