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.

A373339 Number of permutations in symmetric group S_n with an even number of cycles of length 2 or more.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 4
5 36
6 296
7 2360
8 19776
9 180544
10 1812352
11 19953792
12 239490560
13 3113487872
14 43589096448
15 653837077504
16 10461394714624
17 177843713556480
18 3201186851815424
19 60822550202187776
20 1216451004083601408
21 25545471085844758528
22 562000363888782868480

List of values

[1, 1, 1, 1, 4, 36, 296, 2360, 19776, 180544, 1812352, 19953792, 239490560, 3113487872, 43589096448, 653837077504, 10461394714624, 177843713556480, 3201186851815424, 60822550202187776, 1216451004083601408, 25545471085844758528, 562000363888782868480]

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

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