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.

A281262 Number of permutations of [2n] with exactly n fixed points.

Table of values

n a(n)
0 1
1 0
2 6
3 40
4 630
5 11088
6 244860
7 6362928
8 190900710
9 6490575520
10 246642054516
11 10358965584240
12 476512419579196
13 23825620968559200
14 1286583532342313400
15 74621844875699059680
16 4626554382293942780550
17 305352589231397889910080
18 21374681246197861368840900

List of values

[1, 0, 6, 40, 630, 11088, 244860, 6362928, 190900710, 6490575520, 246642054516, 10358965584240, 476512419579196, 23825620968559200, 1286583532342313400, 74621844875699059680, 4626554382293942780550, 305352589231397889910080, 21374681246197861368840900]

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

Content is available under The OEIS End-User License Agreement.