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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.

A326247 Number of labeled n-vertex 2-edge multigraphs that are neither crossing nor nesting.

Table of values

n a(n)
0 0
1 0
2 1
3 9
4 32
5 80
6 165
7 301
8 504
9 792
10 1185
11 1705
12 2376
13 3224
14 4277
15 5565
16 7120
17 8976
18 11169
19 13737
20 16720
21 20160
22 24101
23 28589
24 33672
25 39400
26 45825
27 53001
28 60984
29 69832
30 79605
31 90365
32 102176
33 115104
34 129217
35 144585
36 161280
37 179376
38 198949
39 220077
40 242840

List of values

[0, 0, 1, 9, 32, 80, 165, 301, 504, 792, 1185, 1705, 2376, 3224, 4277, 5565, 7120, 8976, 11169, 13737, 16720, 20160, 24101, 28589, 33672, 39400, 45825, 53001, 60984, 69832, 79605, 90365, 102176, 115104, 129217, 144585, 161280, 179376, 198949, 220077, 242840]

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

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