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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.

A355881 Table read by descending antidiagonals: T(k,n) (k >= 0, n>= 1) is number of ways to (k+2)-color a 3 X n grid ignoring the variations of two colors.

Table of values

n a(n)
0 1
1 1
2 2
3 1
4 9
5 3
6 1
7 41
8 49
9 4
10 1
11 187
12 801
13 169
14 5
15 1
16 853
17 13095
18 7141
19 441
20 6
21 1
22 3891
23 214083
24 301741
25 38897
26 961
27 7
28 1
29 17749
30 3499929
31 12749989
32 3430789
33 153921
34 1849
35 8
36 1
37 80963
38 57218481
39 538747549
40 302602093
41 24653151
42 488401
43 3249
44 9

List of values

[1, 1, 2, 1, 9, 3, 1, 41, 49, 4, 1, 187, 801, 169, 5, 1, 853, 13095, 7141, 441, 6, 1, 3891, 214083, 301741, 38897, 961, 7, 1, 17749, 3499929, 12749989, 3430789, 153921, 1849, 8, 1, 80963, 57218481, 538747549, 302602093, 24653151, 488401, 3249, 9]