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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.

A264520 T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

Table of values

n a(n)
1 1
2 1
3 0
4 1
5 0
6 1
7 2
8 1
9 3
10 0
11 4
12 2
13 9
14 0
15 1
16 6
17 4
18 42
19 36
20 12
21 0
22 9
23 8
24 196
25 228
26 144
27 0
28 1
29 12
30 16
31 644
32 1444
33 1644
34 576
35 46
36 0
37 16
38 32
39 2116
40 8018
41 18769
42 10368
43 2116
44 0
45 1
46 24
47 64
48 6854
49 44521
50 169195
51 186624
52 65182
53 8281
54 177
55 0
56 36
57 128
58 22201
59 258264
60 1525225

List of values

[1, 1, 0, 1, 0, 1, 2, 1, 3, 0, 4, 2, 9, 0, 1, 6, 4, 42, 36, 12, 0, 9, 8, 196, 228, 144, 0, 1, 12, 16, 644, 1444, 1644, 576, 46, 0, 16, 32, 2116, 8018, 18769, 10368, 2116, 0, 1, 24, 64, 6854, 44521, 169195, 186624, 65182, 8281, 177, 0, 36, 128, 22201, 258264, 1525225]