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.

A232370 Number of n X 2 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, diagonally or antidiagonally, and no adjacent values equal.

Table of values

n a(n)
1 2
2 14
3 58
4 230
5 934
6 3794
7 15354
8 62266
9 252346
10 1022806
11 4145638
12 16802922
13 68105158
14 276041834
15 1118844570
16 4534868126
17 18380594246
18 74499685134
19 301959937342
20 1223895154962
21 4960655920226
22 20106384977054
23 81494609451994

List of values

[2, 14, 58, 230, 934, 3794, 15354, 62266, 252346, 1022806, 4145638, 16802922, 68105158, 276041834, 1118844570, 4534868126, 18380594246, 74499685134, 301959937342, 1223895154962, 4960655920226, 20106384977054, 81494609451994]