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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.

A183603 T(n,k)=1/6 the number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock containing all three values.

Table of values

n a(n)
1 6
2 27
3 27
4 120
5 204
6 120
7 534
8 1479
9 1479
10 534
11 2376
12 10797
13 17174
14 10797
15 2376
16 10572
17 78729
18 201770
19 201770
20 78729
21 10572
22 47040
23 574185
24 2366412
25 3831324
26 2366412
27 574185
28 47040
29 209304
30 4187499
31 27768032
32 72592860
33 72592860
34 27768032
35 4187499

List of values

[6, 27, 27, 120, 204, 120, 534, 1479, 1479, 534, 2376, 10797, 17174, 10797, 2376, 10572, 78729, 201770, 201770, 78729, 10572, 47040, 574185, 2366412, 3831324, 2366412, 574185, 47040, 209304, 4187499, 27768032, 72592860, 72592860, 27768032, 4187499]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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