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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.

A264755 Triangle T(n,g) read by rows: Partition of the set of (2n-1)! circular permutations on 2n elements according to the minimal genus g of the surface in which one can immerse the non-simple closed curves with n crossings determined by those permutations.

Table of values

n a(n)
1 1
2 4
3 2
4 42
5 66
6 12
7 780
8 2652
9 1608
10 21552
11 132240
12 183168
13 25920
14 803760
15 7984320
16 20815440
17 10313280

List of values

[1, 4, 2, 42, 66, 12, 780, 2652, 1608, 21552, 132240, 183168, 25920, 803760, 7984320, 20815440, 10313280]

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

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