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.

A263678 Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and with no two consecutive decreases.

Table of values

n a(n)
1 1
2 2
3 5
4 17
5 53
6 155
7 429
8 1210
9 3457
10 9948
11 28528
12 81636
13 233344
14 667390
15 1909626
16 5464861
17 15637212
18 44741387
19 128011961
20 366269502
21 1047988385
22 2998562936
23 8579622673
24 24548350663
25 70238679485
26 200969734254
27 575022887468

List of values

[1, 2, 5, 17, 53, 155, 429, 1210, 3457, 9948, 28528, 81636, 233344, 667390, 1909626, 5464861, 15637212, 44741387, 128011961, 366269502, 1047988385, 2998562936, 8579622673, 24548350663, 70238679485, 200969734254, 575022887468]

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

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