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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.

A123543 Number of connected labeled 2-regular pseudodigraphs (multiple arcs and loops allowed) of order n.

Table of values

n a(n)
0 0
1 1
2 2
3 14
4 201
5 4704
6 160890
7 7538040
8 462869190
9 36055948320
10 3474195588360
11 405786523413600
12 56502317464777800
13 9248640671612865600
14 1758505909558569771600
15 384399253128691423022400
16 95737858067835530264718000
17 26952922550751326069548608000

List of values

[0, 1, 2, 14, 201, 4704, 160890, 7538040, 462869190, 36055948320, 3474195588360, 405786523413600, 56502317464777800, 9248640671612865600, 1758505909558569771600, 384399253128691423022400, 95737858067835530264718000, 26952922550751326069548608000]

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

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