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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.

A272135 Numbers of ways of placing the numbers 1, ..., n on a circle (not counting rotations and reflections) such that for each s in {1, ..., n(n+1)/2}, there exists a connected subset S of the circle such that the numbers covered by S add up to s.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 10
6 41
7 126
8 537
9 3956
10 19776
11 76340
12 388047
13 2775155
14 15013424
15 54188455
16 272147013

List of values

[1, 1, 1, 1, 2, 10, 41, 126, 537, 3956, 19776, 76340, 388047, 2775155, 15013424, 54188455, 272147013]

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

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