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.

A285853 Number of permutations of [n] with two ordered cycles such that equal-sized cycles are ordered with increasing least elements.

Table of values

n a(n)
2 1
3 6
4 19
5 100
6 508
7 3528
8 24876
9 219168
10 1980576
11 21257280
12 234434880
13 2972885760
14 38715943680
15 566931294720
16 8514866707200
17 141468564787200
18 2407290355814400
19 44753976117043200
20 850965783594393600
21 17505896073523200000
22 367844990453821440000

List of values

[1, 6, 19, 100, 508, 3528, 24876, 219168, 1980576, 21257280, 234434880, 2972885760, 38715943680, 566931294720, 8514866707200, 141468564787200, 2407290355814400, 44753976117043200, 850965783594393600, 17505896073523200000, 367844990453821440000]

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

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