n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 15 |
3 | 104 |
4 | 714 |
5 | 4895 |
6 | 33552 |
7 | 229970 |
8 | 1576239 |
9 | 10803704 |
10 | 74049690 |
11 | 507544127 |
12 | 3478759200 |
13 | 23843770274 |
14 | 163427632719 |
15 | 1120149658760 |
16 | 7677619978602 |
17 | 52623190191455 |
18 | 360684711361584 |
19 | 2472169789339634 |
20 | 16944503814015855 |
21 | 116139356908771352 |
22 | 796030994547383610 |
[0,2,15,104,714,4895,33552,229970,1576239, 10803704,74049690,507544127,3478759200, 23843770274,163427632719,1120149658760, 7677619978602,52623190191455,360684711361584, 2472169789339634,16944503814015855, 116139356908771352,796030994547383610] |