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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.

A228772 Number of undirected circular permutations i_0,i_1,...,i_{n-1} of 0,1,...,n-1 such that i_0+i_1+i_2, i_1+i_2+i_3, ..., i_{n-3}+i_{n-2}+i_{n-1}, i_{n-2}+i_{n-1}+i_0, i_{n-1}+i_0+i_1 are pairwise distinct modulo n.

Table of values

n a(n)
3 0
4 3
5 2
6 24
7 24
8 392
9 513
10 4080
11 8090
12 96816
13 238296
14 2023896
15 7325520
16 63277376
17 277838352
18 2185076682
19 12898278126

List of values

[0, 3, 2, 24, 24, 392, 513, 4080, 8090, 96816, 238296, 2023896, 7325520, 63277376, 277838352, 2185076682, 12898278126]

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

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