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.

A232331 Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally, with no adjacent elements equal.

Table of values

n a(n)
1 6
2 32
3 154
4 734
5 3472
6 16338
7 76630
8 358656
9 1676330
10 7828014
11 36533360
12 170436130
13 794923238
14 3706958560
15 17284778298
16 80589690622
17 375729468240
18 1751693001458
19 8166429157878
20 38071572583616
21 177486683779786
22 827424427937102

List of values

[6, 32, 154, 734, 3472, 16338, 76630, 358656, 1676330, 7828014, 36533360, 170436130, 794923238, 3706958560, 17284778298, 80589690622, 375729468240, 1751693001458, 8166429157878, 38071572583616, 177486683779786, 827424427937102]

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

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