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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.

A268563 Number of immersions of unoriented circle into oriented sphere with 2n double points such that two different choices of orientation of the circle are related by geotopy.

Table of values

n a(n)
0 1
1 1
2 5
3 33
4 249
5 2036
6 17572
7 157676
8 1457037

List of values

[1, 1, 5, 33, 249, 2036, 17572, 157676, 1457037]

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

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