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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.

A145222 a(n) is the number of odd permutations (of an n-set) with exactly 1 fixed point.

Table of values

n a(n)
1 0
2 0
3 3
4 0
5 30
6 120
7 945
8 7392
9 66780
10 667440
11 7342335
12 88107360
13 1145396538
14 16035550440
15 240533257965
16 3848532125760
17 65425046139960
18 1177650830516832
19 22375365779822715
20 447507315596450880
21 9397653627525472470
22 206748379805560389720
23 4755212735527888968873

List of values

[0, 0, 3, 0, 30, 120, 945, 7392, 66780, 667440, 7342335, 88107360, 1145396538, 16035550440, 240533257965, 3848532125760, 65425046139960, 1177650830516832, 22375365779822715, 447507315596450880, 9397653627525472470, 206748379805560389720, 4755212735527888968873]

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

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