n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 52 |
4 | 403 |
5 | 3206 |
6 | 25954 |
7 | 212738 |
8 | 1760035 |
9 | 14666470 |
10 | 122920642 |
11 | 1035046816 |
12 | 8749594462 |
13 | 74207078908 |
14 | 631140253072 |
15 | 5381022869822 |
16 | 45975731083555 |
17 | 393556869530630 |
18 | 3374504760608026 |
19 | 28977403637496104 |
20 | 249167023897718138 |
[1,7,52,403,3206,25954,212738,1760035,14666470, 122920642,1035046816,8749594462,74207078908, 631140253072,5381022869822,45975731083555, 393556869530630,3374504760608026, 28977403637496104,249167023897718138] |