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.

A242545 Number of length n+3 0..4 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..4 introduced in 0..4 order.

Table of values

n a(n)
1 13
2 43
3 165
4 690
5 3050
6 13988
7 65588
8 311431
9 1489435
10 7152787
11 34431086
12 165959996
13 800539194
14 3863197403
15 18647303797
16 90021133115
17 434616726192
18 2098395654912
19 10131623972784
20 48918915963483
21 236198983546635

List of values

[13, 43, 165, 690, 3050, 13988, 65588, 311431, 1489435, 7152787, 34431086, 165959996, 800539194, 3863197403, 18647303797, 90021133115, 434616726192, 2098395654912, 10131623972784, 48918915963483, 236198983546635]

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

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