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.

A334779 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly n local maxima.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 88
5 1480
6 40272
7 1476944
8 71865728
9 4454840448
10 343059301120
11 32120367997696
12 3593423957597184
13 473387964389590016
14 72533147097036867584
15 12789470502905585018880
16 2571336187676016073080832
17 584713932920281483718459392
18 149314675071137196105777217536

List of values

[1, 1, 2, 6, 88, 1480, 40272, 1476944, 71865728, 4454840448, 343059301120, 32120367997696, 3593423957597184, 473387964389590016, 72533147097036867584, 12789470502905585018880, 2571336187676016073080832, 584713932920281483718459392, 149314675071137196105777217536]

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

Content is available under The OEIS End-User License Agreement.