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.

A232339 Number of 5Xn 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 1
2 110
3 1282
4 3472
5 38986
6 117690
7 1274656
8 4158066
9 42080048
10 146531864
11 1393415694
12 5138181574
13 46239884144
14 179337779938
15 1537326888338
16 6234688975144
17 51199303984118
18 216023027477120
19 1707858843212112

List of values

[1, 110, 1282, 3472, 38986, 117690, 1274656, 4158066, 42080048, 146531864, 1393415694, 5138181574, 46239884144, 179337779938, 1537326888338, 6234688975144, 51199303984118, 216023027477120, 1707858843212112]

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

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