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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.

A184755 Half the number of n X 3 binary arrays with no 1 having an adjacent 1 both above and to its left.

Table of values

n a(n)
1 4
2 25
3 163
4 1056
5 6847
6 44391
7 287802
8 1865917
9 12097367
10 78431296
11 508496451
12 3296753387
13 21373960178
14 138574567177
15 898425491035
16 5824794400480
17 37764099690423
18 244837350020575
19 1587362824918602
20 10291406673539877

List of values

[4, 25, 163, 1056, 6847, 44391, 287802, 1865917, 12097367, 78431296, 508496451, 3296753387, 21373960178, 138574567177, 898425491035, 5824794400480, 37764099690423, 244837350020575, 1587362824918602, 10291406673539877]

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

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