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.

A200865 Number of 0..2 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 17
2 37
3 77
4 163
5 343
6 723
7 1523
8 3209
9 6761
10 14245
11 30013
12 63235
13 133231
14 280707
15 591427
16 1246089
17 2625409
18 5531525
19 11654477
20 24555043
21 51735495
22 109002515
23 229659507
24 483874057
25 1019483609
26 2147969733
27 4525598973
28 9535072003

List of values

[17, 37, 77, 163, 343, 723, 1523, 3209, 6761, 14245, 30013, 63235, 133231, 280707, 591427, 1246089, 2625409, 5531525, 11654477, 24555043, 51735495, 109002515, 229659507, 483874057, 1019483609, 2147969733, 4525598973, 9535072003]

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

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