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.

A207509 Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 1 vertically.

Table of values

n a(n)
1 6
2 36
3 72
4 166
5 360
6 660
7 1292
8 2400
9 4396
10 8096
11 14580
12 26346
13 47336
14 84502
15 150976
16 268594
17 477130
18 846850
19 1500112
20 2655880
21 4697786
22 8303004
23 14669200
24 25901790
25 45719422
26 80675866
27 142317030
28 251007562
29 442623618
30 780396916
31 1375769956

List of values

[6, 36, 72, 166, 360, 660, 1292, 2400, 4396, 8096, 14580, 26346, 47336, 84502, 150976, 268594, 477130, 846850, 1500112, 2655880, 4697786, 8303004, 14669200, 25901790, 45719422, 80675866, 142317030, 251007562, 442623618, 780396916, 1375769956]

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

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