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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.

A264017 T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having index change +-(.,.) 0,0 1,2 or 2,2.

Table of values

n a(n)
1 1
2 2
3 1
4 4
5 5
6 1
7 8
8 25
9 13
10 1
11 16
12 105
13 169
14 34
15 1
16 32
17 441
18 1573
19 1156
20 89
21 1
22 64
23 1869
24 14641
25 20570
26 7921
27 233
28 1
29 128
30 7921
31 146410
32 366025
33 269225
34 54289
35 610
36 1
37 256
38 33553
39 1464100
40 7320500
41 9150625
42 3524125
43 372100
44 1597
45 1
46 512
47 142129
48 14641000

List of values

[1, 2, 1, 4, 5, 1, 8, 25, 13, 1, 16, 105, 169, 34, 1, 32, 441, 1573, 1156, 89, 1, 64, 1869, 14641, 20570, 7921, 233, 1, 128, 7921, 146410, 366025, 269225, 54289, 610, 1, 256, 33553, 1464100, 7320500, 9150625, 3524125, 372100, 1597, 1, 512, 142129, 14641000]