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.

A207402 Number of n X 7 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.

Table of values

n a(n)
1 20
2 400
3 2340
4 8910
5 26676
6 68060
7 154580
8 321110
9 621300
10 1134296
11 1972900
12 3293310
13 5306580
14 8291940
15 12612116
16 18730790
17 27232340
18 38844000
19 54460580
20 75171886
21 102292980
22 137397420
23 182353620
24 239364470
25 311010356
26 400295720

List of values

[20, 400, 2340, 8910, 26676, 68060, 154580, 321110, 621300, 1134296, 1972900, 3293310, 5306580, 8291940, 12612116, 18730790, 27232340, 38844000, 54460580, 75171886, 102292980, 137397420, 182353620, 239364470, 311010356, 400295720]

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

Content is available under The OEIS End-User License Agreement.