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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.

A235940 Number of circular permutations with exactly one (unspecified) increasing or decreasing modular 3-sequence, with clockwise and counterclockwise traversals counted as distinct.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 10
6 24
7 154
8 992
9 7344
10 61120
11 568062
12 5827248
13 65449878
14 799122856
15 10541495760
16 149434080256
17 2265793149218
18 36594799613064
19 627269647629538
20 11373729261469680
21 217514607586602480

List of values

[0, 0, 0, 0, 10, 24, 154, 992, 7344, 61120, 568062, 5827248, 65449878, 799122856, 10541495760, 149434080256, 2265793149218, 36594799613064, 627269647629538, 11373729261469680, 217514607586602480]

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

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