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.

A097900 Number of runs of length 1 in all permutations of [n]. (The permutation 3574162 has two runs of length 1: 357/4/16/2.)

Table of values

n a(n)
1 1
2 2
3 7
4 32
5 180
6 1200
7 9240
8 80640
9 786240
10 8467200
11 99792000
12 1277337600
13 17643225600
14 261534873600
15 4140968832000
16 69742632960000
17 1244905998336000
18 23475370254336000
19 466306218233856000
20 9731608032706560000

List of values

[1, 2, 7, 32, 180, 1200, 9240, 80640, 786240, 8467200, 99792000, 1277337600, 17643225600, 261534873600, 4140968832000, 69742632960000, 1244905998336000, 23475370254336000, 466306218233856000, 9731608032706560000]

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

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