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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.

A269194 T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 4
2 16
3 16
4 60
5 108
6 60
7 216
8 708
9 708
10 216
11 756
12 4476
13 9284
14 4476
15 756
16 2592
17 27684
18 115452
19 115452
20 27684
21 2592
22 8748
23 168252
24 1399612
25 2817548
26 1399612
27 168252
28 8748
29 29160
30 1008804
31 16629436
32 67134380
33 67134380
34 16629436
35 1008804
36 29160

List of values

[4, 16, 16, 60, 108, 60, 216, 708, 708, 216, 756, 4476, 9284, 4476, 756, 2592, 27684, 115452, 115452, 27684, 2592, 8748, 168252, 1399612, 2817548, 1399612, 168252, 8748, 29160, 1008804, 16629436, 67134380, 67134380, 16629436, 1008804, 29160]

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

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