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.

A295531 T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally or vertically adjacent to 1, 2 or 4 1s.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 10
6 4
7 7
8 29
9 29
10 7
11 12
12 87
13 147
14 87
15 12
16 21
17 280
18 774
19 774
20 280
21 21
22 37
23 876
24 4080
25 7071
26 4080
27 876
28 37
29 65
30 2735
31 21489
32 64189
33 64189
34 21489
35 2735
36 65
37 114
38 8583
39 113466
40 588529
41 1012315
42 588529
43 113466
44 8583
45 114
46 200
47 26900
48 598374
49 5400933

List of values

[1, 2, 2, 4, 10, 4, 7, 29, 29, 7, 12, 87, 147, 87, 12, 21, 280, 774, 774, 280, 21, 37, 876, 4080, 7071, 4080, 876, 37, 65, 2735, 21489, 64189, 64189, 21489, 2735, 65, 114, 8583, 113466, 588529, 1012315, 588529, 113466, 8583, 114, 200, 26900, 598374, 5400933]