cp's OEIS Frontend

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.

A159720 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 40272
7 62954948
8 24342647424
9 5320007368884
10 848044852469680
11 111078667024032048
12 12769013592631944576
13 1340902091662029846456
14 132008300342568131914656
15 12398363733385845967412220
16 1124539850663707285433353472
17 99357839137277548804214431980

List of values

[0, 0, 0, 0, 0, 40272, 62954948, 24342647424, 5320007368884, 848044852469680, 111078667024032048, 12769013592631944576, 1340902091662029846456, 132008300342568131914656, 12398363733385845967412220, 1124539850663707285433353472, 99357839137277548804214431980]

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

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