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.

A177548 Number of permutations of {1,...,n} avoiding adjacent step pattern up, up, down, down, down, down.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5025
8 40080
9 359640
10 3585600
11 39322800
12 470448000
13 6097392939
14 85106238492
15 1272746220570
16 20302567148160
17 344103461618400
18 6175195781293440
19 116975122363277289
20 2332451810975205960
21 48833870901559002540
22 1071107370496773577440

List of values

[1, 1, 2, 6, 24, 120, 720, 5025, 40080, 359640, 3585600, 39322800, 470448000, 6097392939, 85106238492, 1272746220570, 20302567148160, 344103461618400, 6175195781293440, 116975122363277289, 2332451810975205960, 48833870901559002540, 1071107370496773577440]

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

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