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.

A323800 Number of permutations p of [n] such that max_{j=1..n} |p(j)-j| = 4.

Table of values

n a(n)
4 0
5 42
6 274
7 1227
8 4833
9 18827
10 75693
11 304900
12 1212960
13 4753020
14 18410363
15 70943107
16 272701262
17 1046410914
18 4007815161
19 15319362279
20 58456445860
21 222775782355
22 848216866767
23 3227396592600
24 12273205919568
25 46650941505906
26 177252609519698
27 673266690295879

List of values

[0, 42, 274, 1227, 4833, 18827, 75693, 304900, 1212960, 4753020, 18410363, 70943107, 272701262, 1046410914, 4007815161, 15319362279, 58456445860, 222775782355, 848216866767, 3227396592600, 12273205919568, 46650941505906, 177252609519698, 673266690295879]

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

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