n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 60 |
7 | 1080 |
8 | 11970 |
9 | 105840 |
10 | 821592 |
11 | 5873760 |
12 | 39705630 |
13 | 258121080 |
14 | 1631169900 |
15 | 10096542792 |
16 | 61535329380 |
17 | 370709045280 |
18 | 2213740488600 |
19 | 13132064237040 |
20 | 77509384111278 |
21 | 455754440462040 |
22 | 2672268921657540 |
23 | 15636049474529880 |
24 | 91353538645037220 |
25 | 533180401444362672 |
[0,0,0,0,0,60,1080,11970,105840,821592,5873760, 39705630,258121080,1631169900,10096542792, 61535329380,370709045280,2213740488600, 13132064237040,77509384111278,455754440462040, 2672268921657540,15636049474529880, 91353538645037220,533180401444362672] |