n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 15 |
5 | 240 |
6 | 2604 |
7 | 24180 |
8 | 207732 |
9 | 1710108 |
10 | 13739550 |
11 | 108853512 |
12 | 855732465 |
13 | 6700902804 |
14 | 52395480996 |
15 | 409733313444 |
16 | 3207687963129 |
17 | 25155951725808 |
18 | 197703130100532 |
19 | 1557413160706764 |
20 | 12298597436673711 |
21 | 97359729090421320 |
22 | 772615510913274126 |
23 | 6145842794363133324 |
[0,0,0,15,240,2604,24180,207732,1710108,13739550, 108853512,855732465,6700902804,52395480996, 409733313444,3207687963129,25155951725808, 197703130100532,1557413160706764, 12298597436673711,97359729090421320, 772615510913274126,6145842794363133324] |