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.

A242467 Number of length n+2 0..n arrays with no three equal elements in a row and new values 0..n introduced in 0..n order.

Table of values

n a(n)
1 3
2 11
3 40
4 158
5 684
6 3232
7 16533
8 90862
9 533013
10 3319374
11 21844874
12 151329961
13 1099822975
14 8361244270
15 66320787389
16 547602710173
17 4697109624463
18 41777867546600
19 384671271459042
20 3661037447467530
21 35965775221739498

List of values

[3, 11, 40, 158, 684, 3232, 16533, 90862, 533013, 3319374, 21844874, 151329961, 1099822975, 8361244270, 66320787389, 547602710173, 4697109624463, 41777867546600, 384671271459042, 3661037447467530, 35965775221739498]

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

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