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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.

A060435 Number of functions f: {1,2,...,n} -> {1,2,...,n} with even cycles only.

Table of values

n a(n)
0 1
1 0
2 1
3 6
4 57
5 680
6 9945
7 172032
8 3438673
9 78003648
10 1980083025
11 55616359040
12 1712630427849
13 57375166877184
14 2077563829893097
15 80859304977696000
16 3366275257190794785
17 149270897223530835968
18 7024011523121427204897
19 349574012216588890718208

List of values

[1, 0, 1, 6, 57, 680, 9945, 172032, 3438673, 78003648, 1980083025, 55616359040, 1712630427849, 57375166877184, 2077563829893097, 80859304977696000, 3366275257190794785, 149270897223530835968, 7024011523121427204897, 349574012216588890718208]

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

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