n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 18 |
5 | 98 |
6 | 630 |
7 | 4676 |
8 | 39368 |
9 | 370748 |
10 | 3861900 |
11 | 44087008 |
12 | 547360968 |
13 | 7342948312 |
14 | 105848450344 |
15 | 1631635791184 |
16 | 26782838577600 |
17 | 466413214471568 |
18 | 8588795078851344 |
19 | 166747235206457024 |
20 | 3404055687248777120 |
21 | 72895914363584236064 |
22 | 1633918325381940384864 |
[0,1,1,4,18,98,630,4676,39368,370748,3861900, 44087008,547360968,7342948312,105848450344, 1631635791184,26782838577600,466413214471568, 8588795078851344,166747235206457024, 3404055687248777120,72895914363584236064, 1633918325381940384864] |