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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.

A183305 Half the number of nX4 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.

Table of values

n a(n)
1 2
2 6
3 19
4 55
5 178
6 572
7 1798
8 5700
9 18064
10 57249
11 181433
12 574924
13 1821857
14 5773450
15 18295845
16 57978643
17 183731482
18 582236576
19 1845081304
20 5846978390
21 18528805856
22 58716935815
23 186071279593
24 589651361292
25 1868578146701
26 5921438527588

List of values

[2, 6, 19, 55, 178, 572, 1798, 5700, 18064, 57249, 181433, 574924, 1821857, 5773450, 18295845, 57978643, 183731482, 582236576, 1845081304, 5846978390, 18528805856, 58716935815, 186071279593, 589651361292, 1868578146701, 5921438527588]

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

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