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.

A232338 Number of 4Xn 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 42
3 308
4 734
5 4906
6 13170
7 82526
8 239992
9 1398710
10 4333362
11 23808020
12 77703762
13 406751730
14 1385692672
15 6971295054
16 24603895150
17 119805137680
18 435349233940
19 2063663956954
20 7681867046626
21 35616414149972
22 135245995065394

List of values

[1, 42, 308, 734, 4906, 13170, 82526, 239992, 1398710, 4333362, 23808020, 77703762, 406751730, 1385692672, 6971295054, 24603895150, 119805137680, 435349233940, 2063663956954, 7681867046626, 35616414149972, 135245995065394]

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

Content is available under The OEIS End-User License Agreement.