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.

A200869 Number of 0..6 arrays x(0..n+1) of n+2 elements without any interior element greater than both neighbors or less than both neighbors.

Table of values

n a(n)
1 161
2 595
3 2163
4 7973
5 29325
6 107777
7 395929
8 1454643
9 5344795
10 19638715
11 72159035
12 265134245
13 974183489
14 3579448271
15 13151993143
16 48324463973
17 177558916493
18 652405957937
19 2397139747601
20 8807827288183
21 32362661242755
22 118910351874471

List of values

[161, 595, 2163, 7973, 29325, 107777, 395929, 1454643, 5344795, 19638715, 72159035, 265134245, 974183489, 3579448271, 13151993143, 48324463973, 177558916493, 652405957937, 2397139747601, 8807827288183, 32362661242755, 118910351874471]

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

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