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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.

A264759 Number of irreducible indecomposable spherical curves with n crossings (only ordinary double points), the circle is not oriented, the sphere is not oriented (UU case).

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 2
6 3
7 10
8 27
9 101
10 364
11 1610
12 7202
13 34659
14 170692
15 864590
16 4463287
17 23415443
18 124526110
19 670224294
20 3644907768
21 20011145443
22 110794212315
23 618187581204

List of values

[0, 0, 1, 1, 2, 3, 10, 27, 101, 364, 1610, 7202, 34659, 170692, 864590, 4463287, 23415443, 124526110, 670224294, 3644907768, 20011145443, 110794212315, 618187581204]

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

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