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.

A228385 Number of n X 3 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.

Table of values

n a(n)
1 2
2 5
3 21
4 72
5 268
6 963
7 3513
8 12732
9 46274
10 167977
11 610085
12 2215300
13 8044836
14 29213495
15 106085921
16 385237512
17 1398945714
18 5080103005
19 18447794373
20 66990969264
21 243269759052
22 883405230683
23 3207981221305
24 11649402857444

List of values

[2, 5, 21, 72, 268, 963, 3513, 12732, 46274, 167977, 610085, 2215300, 8044836, 29213495, 106085921, 385237512, 1398945714, 5080103005, 18447794373, 66990969264, 243269759052, 883405230683, 3207981221305, 11649402857444]

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

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