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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.

A334772 Array read by antidiagonals: T(n,k) is the number of permutations of k indistinguishable copies of 1..n arranged in a circle with exactly 2 local maxima.

Table of values

n a(n)
2 2
3 12
4 66
5 36
6 576
7 1168
8 80
9 2610
10 17376
11 16220
12 150
13 8520
14 129800
15 448800
16 202416
17 252
18 22680
19 659560
20 5748750
21 10861056
22 2395540
23 392
24 52416
25 2596608
26 46412200
27 241987500
28 253940736
29 27517568
30 576
31 109116
32 8505728
33 273322980
34 3121135440
35 9885006250
36 5807161344
37 310123764

List of values

[2, 12, 66, 36, 576, 1168, 80, 2610, 17376, 16220, 150, 8520, 129800, 448800, 202416, 252, 22680, 659560, 5748750, 10861056, 2395540, 392, 52416, 2596608, 46412200, 241987500, 253940736, 27517568, 576, 109116, 8505728, 273322980, 3121135440, 9885006250, 5807161344, 310123764]

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

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