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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.

A363180 Number of permutations of [2n] with n parity changes.

Table of values

n a(n)
0 1
1 2
2 8
3 288
4 10368
5 1036800
6 103680000
7 20321280000
8 3982970880000
9 1290482565120000
10 418116351098880000
11 202368313931857920000
12 97946263943019233280000
13 66211674425481001697280000
14 44759091911625157147361280000
15 40283182720462641432625152000000

List of values

[1, 2, 8, 288, 10368, 1036800, 103680000, 20321280000, 3982970880000, 1290482565120000, 418116351098880000, 202368313931857920000, 97946263943019233280000, 66211674425481001697280000, 44759091911625157147361280000, 40283182720462641432625152000000]

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

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