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.

A000440 Number of permutations of an n-sequence discordant with three given permutations (see reference) in n-4 places.

Table of values

n a(n)
4 9
5 30
6 180
7 980
8 8326
9 70272
10 695690
11 7518720
12 89193276
13 1148241458
14 15947668065
15 237613988040
16 3780133322620
17 63945806121448
18 1146081593303784
19 21693271558730304
20 432411684714253605
21 9053476937543082240
22 198641103956454088919

List of values

[9, 30, 180, 980, 8326, 70272, 695690, 7518720, 89193276, 1148241458, 15947668065, 237613988040, 3780133322620, 63945806121448, 1146081593303784, 21693271558730304, 432411684714253605, 9053476937543082240, 198641103956454088919]

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

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