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.

A249701 Number of length n+3 0..2 arrays with every four consecutive terms having the maximum of some two terms equal to the minimum of the remaining two terms.

Table of values

n a(n)
1 39
2 69
3 125
4 221
5 377
6 659
7 1177
8 2119
9 3805
10 6857
11 12437
12 22681
13 41475
14 76011
15 139645
16 257161
17 474439
18 876539
19 1621387
20 3002407
21 5564769
22 10321599
23 19156321
24 35571383
25 66081147
26 122803551
27 228283091
28 424467169
29 789412673
30 1468380739

List of values

[39, 69, 125, 221, 377, 659, 1177, 2119, 3805, 6857, 12437, 22681, 41475, 76011, 139645, 257161, 474439, 876539, 1621387, 3002407, 5564769, 10321599, 19156321, 35571383, 66081147, 122803551, 228283091, 424467169, 789412673, 1468380739]

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

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