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.

A183325 Number of n X 4 binary arrays with each 1 adjacent to exactly two other 1s.

Table of values

n a(n)
1 1
2 4
3 10
4 27
5 72
6 179
7 447
8 1139
9 2912
10 7434
11 18949
12 48256
13 122905
14 313153
15 797993
16 2033404
17 5181138
18 13201355
19 33636776
20 85706587
21 218381247
22 556436971
23 1417803304
24 3612566114
25 9204828661
26 23453934912
27 59760710321
28 152270499073

List of values

[1, 4, 10, 27, 72, 179, 447, 1139, 2912, 7434, 18949, 48256, 122905, 313153, 797993, 2033404, 5181138, 13201355, 33636776, 85706587, 218381247, 556436971, 1417803304, 3612566114, 9204828661, 23453934912, 59760710321, 152270499073]

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

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