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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.

A200867 Number of 0..4 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 65
2 195
3 567
4 1673
5 4917
6 14455
7 42479
8 124851
9 366959
10 1078565
11 3170093
12 9317449
13 27385589
14 80491001
15 236577045
16 695341043
17 2043728099
18 6006871845
19 17655239697
20 51891816107
21 152519060911
22 448280011791
23 1317572818499
24 3872575368989

List of values

[65, 195, 567, 1673, 4917, 14455, 42479, 124851, 366959, 1078565, 3170093, 9317449, 27385589, 80491001, 236577045, 695341043, 2043728099, 6006871845, 17655239697, 51891816107, 152519060911, 448280011791, 1317572818499, 3872575368989]

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

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