n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 60 |
6 | 204 |
7 | 734 |
8 | 2694 |
9 | 10162 |
10 | 38982 |
11 | 151920 |
12 | 599244 |
13 | 2389028 |
14 | 9608668 |
15 | 38945230 |
16 | 158904230 |
17 | 652178206 |
18 | 2690598570 |
19 | 11151718166 |
20 | 46412717826 |
21 | 193891596436 |
22 | 812748036380 |
23 | 3417407089470 |
24 | 14410094628558 |
25 | 60920843101858 |
26 | 258169745573158 |
27 | 1096494947168142 |
[1,2,6,18,60,204,734,2694,10162,38982,151920, 599244,2389028,9608668,38945230,158904230, 652178206,2690598570,11151718166,46412717826, 193891596436,812748036380,3417407089470, 14410094628558,60920843101858,258169745573158, 1096494947168142] |