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.

A322481 Permutation breadth triangle: B(n,k) is the number of permutations w in S_n with breadth(w) = k, where breadth(w) = min({ |i-j|+|w(i)-w(j)| : 1 <= i < j <= n }).

Table of values

n a(n)
1 0
2 0
3 2
4 0
5 6
6 0
7 0
8 22
9 2
10 0
11 0
12 106
13 14
14 0
15 0
16 0
17 630
18 90
19 0
20 0
21 0
22 0
23 4394
24 644
25 2
26 0
27 0
28 0
29 0
30 35078
31 5222
32 20
33 0
34 0
35 0
36 0
37 0
38 315258
39 47464
40 158
41 0
42 0
43 0
44 0
45 0
46 0
47 3149494
48 477346
49 1960
50 0
51 0
52 0
53 0
54 0
55 0

List of values

[0, 0, 2, 0, 6, 0, 0, 22, 2, 0, 0, 106, 14, 0, 0, 0, 630, 90, 0, 0, 0, 0, 4394, 644, 2, 0, 0, 0, 0, 35078, 5222, 20, 0, 0, 0, 0, 0, 315258, 47464, 158, 0, 0, 0, 0, 0, 0, 3149494, 477346, 1960, 0, 0, 0, 0, 0, 0]