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.

A212650 Number of permutations of n elements with at least one fixed point and at least one 2-cycle (transposition).

Table of values

n a(n)
0 0
1 0
2 0
3 3
4 6
5 25
6 180
7 1281
8 10010
9 90063
10 902790
11 9929755
12 119134224
13 1548768585
14 21683033372
15 325245031125
16 5203916869710
17 88466595897631
18 1592398778725710
19 30255576613653483
20 605111531456405960
21 12707342164389159945
22 279561527629906821684

List of values

[0, 0, 0, 3, 6, 25, 180, 1281, 10010, 90063, 902790, 9929755, 119134224, 1548768585, 21683033372, 325245031125, 5203916869710, 88466595897631, 1592398778725710, 30255576613653483, 605111531456405960, 12707342164389159945, 279561527629906821684]

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

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