n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 16 |
4 | 120 |
5 | 960 |
6 | 8400 |
7 | 80640 |
8 | 846720 |
9 | 9676800 |
10 | 119750400 |
11 | 1596672000 |
12 | 22832409600 |
13 | 348713164800 |
14 | 5666588928000 |
15 | 97639686144000 |
16 | 1778437140480000 |
17 | 34145993097216000 |
18 | 689322235650048000 |
19 | 14597412049059840000 |
20 | 323575967087493120000 |
21 | 7493338185184051200000 |
[0,2,16,120,960,8400,80640,846720,9676800, 119750400,1596672000,22832409600,348713164800, 5666588928000,97639686144000,1778437140480000, 34145993097216000,689322235650048000, 14597412049059840000,323575967087493120000, 7493338185184051200000] |