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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.

A264550 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 -1,1 -1,2 1,0 or 0,-1.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 2
6 0
7 1
8 6
9 5
10 0
11 1
12 16
13 16
14 10
15 1
16 3
17 40
18 36
19 45
20 21
21 0
22 3
23 96
24 172
25 216
26 133
27 44
28 0
29 4
30 240
31 764
32 1528
33 1160
34 400
35 93
36 1
37 6
38 608
39 2728
40 11728
41 14852
42 4640
43 1204
44 196
45 0
46 9
47 1536
48 9880
49 66372
50 163744
51 105081
52 23140
53 3561
54 413
55 0
56 12
57 3840
58 38818
59 403920

List of values

[0, 1, 1, 1, 2, 0, 1, 6, 5, 0, 1, 16, 16, 10, 1, 3, 40, 36, 45, 21, 0, 3, 96, 172, 216, 133, 44, 0, 4, 240, 764, 1528, 1160, 400, 93, 1, 6, 608, 2728, 11728, 14852, 4640, 1204, 196, 0, 9, 1536, 9880, 66372, 163744, 105081, 23140, 3561, 413, 0, 12, 3840, 38818, 403920]