n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 8 |
6 | 38 |
7 | 206 |
8 | 1200 |
9 | 7034 |
10 | 53012 |
11 | 465190 |
12 | 4072948 |
13 | 40967916 |
14 | 438348328 |
15 | 5113450320 |
16 | 63135973560 |
17 | 835727519000 |
18 | 11736948927176 |
19 | 175225673352928 |
20 | 2749604628466960 |
21 | 45540211979269216 |
22 | 791473522065224592 |
23 | 14405894145521294480 |
24 | 274114459633006310336 |
[1,1,1,4,8,38,206,1200,7034,53012,465190,4072948, 40967916,438348328,5113450320,63135973560, 835727519000,11736948927176,175225673352928, 2749604628466960,45540211979269216, 791473522065224592,14405894145521294480, 274114459633006310336] |