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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.

A264628 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 -2,0 -1,0 0,-1 or 1,1.

Table of values

n a(n)
1 0
2 1
3 1
4 0
5 2
6 2
7 0
8 4
9 4
10 1
11 1
12 9
13 13
14 8
15 1
16 0
17 16
18 40
19 22
20 16
21 4
22 0
23 37
24 125
25 108
26 61
27 32
28 6
29 1
30 76
31 393
32 684
33 660
34 280
35 64
36 5
37 0
38 160
39 1200
40 2736
41 6107
42 4032
43 832
44 128
45 7
46 0
47 337
48 3759
49 13556
50 37225
51 50353
52 19521
53 2373
54 256
55 15
56 1
57 704
58 11572
59 68972
60 349391
61 604916

List of values

[0, 1, 1, 0, 2, 2, 0, 4, 4, 1, 1, 9, 13, 8, 1, 0, 16, 40, 22, 16, 4, 0, 37, 125, 108, 61, 32, 6, 1, 76, 393, 684, 660, 280, 64, 5, 0, 160, 1200, 2736, 6107, 4032, 832, 128, 7, 0, 337, 3759, 13556, 37225, 50353, 19521, 2373, 256, 15, 1, 704, 11572, 68972, 349391, 604916]