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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.

A264341 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 0,1 or 1,2.

Table of values

n a(n)
1 4
2 13
3 8
4 49
5 55
6 16
7 181
8 490
9 233
10 32
11 676
12 3567
13 4900
14 987
15 64
16 2521
17 28925
18 70669
19 49000
20 4181
21 128
22 9409
23 223356
24 1243225
25 1399783
26 490000
27 17711
28 256
29 35113
30 1759250
31 20386617
32 53429620
33 27726581
34 4900000
35 75025
36 512
37 131044
38 13750304

List of values

[4, 13, 8, 49, 55, 16, 181, 490, 233, 32, 676, 3567, 4900, 987, 64, 2521, 28925, 70669, 49000, 4181, 128, 9409, 223356, 1243225, 1399783, 490000, 17711, 256, 35113, 1759250, 20386617, 53429620, 27726581, 4900000, 75025, 512, 131044, 13750304]