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.

A370529 Number of permutations of [n] having exactly three adjacent 2-cycles.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 1
7 4
8 16
9 100
10 730
11 5940
12 54160
13 547540
14 6077155
15 73473400
16 961231264
17 13530711096
18 203921897844
19 3276281076600
20 55900700199840
21 1009488884673720
22 19236189509000805
23 385733279064689820
24 8119635049867486640
25 179017704376149395900

List of values

[0, 0, 0, 0, 0, 0, 1, 4, 16, 100, 730, 5940, 54160, 547540, 6077155, 73473400, 961231264, 13530711096, 203921897844, 3276281076600, 55900700199840, 1009488884673720, 19236189509000805, 385733279064689820, 8119635049867486640, 179017704376149395900]

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

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