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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.

A221027 Sum of neighbor maps: log base 2 of the number of nX7 binary arrays indicating the locations of corresponding elements equal to the sum mod 2 of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nX7 array.

Table of values

n a(n)
1 7
2 13
3 19
4 27
5 35
6 42
7 45
8 53
9 62
10 69
11 72
12 83
13 90
14 95
15 101
16 112
17 119
18 125
19 131
20 139
21 147
22 154
23 154
24 168
25 175
26 181
27 187
28 195
29 203
30 210
31 213

List of values

[7, 13, 19, 27, 35, 42, 45, 53, 62, 69, 72, 83, 90, 95, 101, 112, 119, 125, 131, 139, 147, 154, 154, 168, 175, 181, 187, 195, 203, 210, 213]

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

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