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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.

A189610 T(n,k)=Number of nXk array permutations with each element not moving, or moving one space E, S or NW.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 1
7 1
8 6
9 6
10 1
11 1
12 13
13 20
14 13
15 1
16 1
17 28
18 72
19 72
20 28
21 1
22 1
23 60
24 256
25 464
26 256
27 60
28 1
29 1
30 129
31 912
32 2853
33 2853
34 912
35 129
36 1
37 1
38 277
39 3248
40 17617
41 30283
42 17617
43 3248
44 277
45 1
46 1
47 595
48 11568
49 108785
50 321815
51 321815
52 108785
53 11568
54 595
55 1
56 1
57 1278
58 41200
59 671452

List of values

[1, 1, 1, 1, 3, 1, 1, 6, 6, 1, 1, 13, 20, 13, 1, 1, 28, 72, 72, 28, 1, 1, 60, 256, 464, 256, 60, 1, 1, 129, 912, 2853, 2853, 912, 129, 1, 1, 277, 3248, 17617, 30283, 17617, 3248, 277, 1, 1, 595, 11568, 108785, 321815, 321815, 108785, 11568, 595, 1, 1, 1278, 41200, 671452]