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.

A269614 Number of length-n 0..3 arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

Table of values

n a(n)
1 4
2 16
3 64
4 249
5 954
6 3611
7 13544
8 50442
9 186822
10 688899
11 2531406
12 9275757
13 33912330
14 123759252
15 450985950
16 1641487455
17 5969001906
18 21688869249
19 78760649178
20 285872602590
21 1037218320720
22 3762161399673
23 13642773106086
24 49463937282915

List of values

[4, 16, 64, 249, 954, 3611, 13544, 50442, 186822, 688899, 2531406, 9275757, 33912330, 123759252, 450985950, 1641487455, 5969001906, 21688869249, 78760649178, 285872602590, 1037218320720, 3762161399673, 13642773106086, 49463937282915]

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

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