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.

A086852 Number of permutations of length n with exactly 1 rising or falling succession.

Table of values

n a(n)
0 0
1 0
2 2
3 4
4 10
5 40
6 230
7 1580
8 12434
9 110320
10 1090270
11 11876980
12 141373610
13 1825321016
14 25405388150
15 379158271420
16 6039817462210
17 102278890975360
18 1834691141852174
19 34752142215026180
20 693126840194499290
21 14519428780464454600
22 318705819455462421670

List of values

[0, 0, 2, 4, 10, 40, 230, 1580, 12434, 110320, 1090270, 11876980, 141373610, 1825321016, 25405388150, 379158271420, 6039817462210, 102278890975360, 1834691141852174, 34752142215026180, 693126840194499290, 14519428780464454600, 318705819455462421670]

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

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