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.

A328648 Number of permutations p of [n] such that |p(i) - p(i-1)| is in {2,7} for all i from 2 to n.

Table of values

n a(n)
0 1
1 1
2 0
3 0
4 0
5 0
6 0
7 0
8 2
9 18
10 12
11 0
12 12
13 62
14 76
15 32
16 44
17 162
18 600
19 714
20 386
21 550
22 2514
23 5320
24 4140
25 3336
26 8626
27 24722
28 33428
29 27110
30 34812
31 96210
32 200322
33 220360
34 213368
35 376178
36 894780
37 1400578
38 1473944
39 1810538
40 3653304
41 7170370
42 9467970

List of values

[1, 1, 0, 0, 0, 0, 0, 0, 2, 18, 12, 0, 12, 62, 76, 32, 44, 162, 600, 714, 386, 550, 2514, 5320, 4140, 3336, 8626, 24722, 33428, 27110, 34812, 96210, 200322, 220360, 213368, 376178, 894780, 1400578, 1473944, 1810538, 3653304, 7170370, 9467970]

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

Content is available under The OEIS End-User License Agreement.