cp's OEIS Frontend

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.

A232161 T(n,k)=Number of nXk 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 18
6 4
7 8
8 62
9 62
10 8
11 14
12 218
13 290
14 218
15 14
16 26
17 746
18 1284
19 1284
20 746
21 26
22 48
23 2600
24 5902
25 7770
26 5902
27 2600
28 48
29 88
30 9004
31 27086
32 46702
33 46702
34 27086
35 9004
36 88
37 162
38 31262
39 124436
40 286770
41 382996
42 286770
43 124436
44 31262
45 162
46 298
47 108492
48 572080

List of values

[1, 2, 2, 4, 18, 4, 8, 62, 62, 8, 14, 218, 290, 218, 14, 26, 746, 1284, 1284, 746, 26, 48, 2600, 5902, 7770, 5902, 2600, 48, 88, 9004, 27086, 46702, 46702, 27086, 9004, 88, 162, 31262, 124436, 286770, 382996, 286770, 124436, 31262, 162, 298, 108492, 572080]