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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.

A303102 T(n,k)=Number of nXk 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 1
3 0
4 1
5 3
6 0
7 2
8 15
9 11
10 0
11 3
12 46
13 77
14 34
15 0
16 5
17 161
18 431
19 486
20 111
21 0
22 8
23 601
24 2913
25 4667
26 2869
27 361
28 0
29 13
30 2208
31 19393
32 58160
33 49534
34 17229
35 1172
36 0
37 21
38 8053
39 128921
40 709333
41 1138331
42 523578
43 102952
44 3809
45 0
46 34
47 29415
48 857789
49 8650205
50 25372284
51 22292709

List of values

[0, 1, 0, 1, 3, 0, 2, 15, 11, 0, 3, 46, 77, 34, 0, 5, 161, 431, 486, 111, 0, 8, 601, 2913, 4667, 2869, 361, 0, 13, 2208, 19393, 58160, 49534, 17229, 1172, 0, 21, 8053, 128921, 709333, 1138331, 523578, 102952, 3809, 0, 34, 29415, 857789, 8650205, 25372284, 22292709]

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

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