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.

A249703 Number of length n+3 0..4 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)
1 205
2 485
3 1153
4 2601
5 5425
6 11925
7 27113
8 61725
9 137593
10 307437
11 694273
12 1576625
13 3567829
14 8061981
15 18257849
16 41462221
17 94184277
18 213859241
19 485808309
20 1104769313
21 2514006025
22 5722098441
23 13027345657
24 29673996009
25 67626829493

List of values

[205, 485, 1153, 2601, 5425, 11925, 27113, 61725, 137593, 307437, 694273, 1576625, 3567829, 8061981, 18257849, 41462221, 94184277, 213859241, 485808309, 1104769313, 2514006025, 5722098441, 13027345657, 29673996009, 67626829493]

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

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