n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 52 |
4 | 517 |
5 | 5615 |
6 | 64587 |
7 | 772961 |
8 | 9526304 |
9 | 120084968 |
10 | 1541062520 |
11 | 20066028177 |
12 | 264441631790 |
13 | 3520463590183 |
14 | 47274535397701 |
15 | 639587090815124 |
16 | 8709694025888081 |
17 | 119288137354977880 |
18 | 1642104576551818747 |
19 | 22707897424654348214 |
20 | 315300786621008803900 |
[1,1,6,52,517,5615,64587,772961,9526304,120084968, 1541062520,20066028177,264441631790,3520463590183, 47274535397701,639587090815124,8709694025888081, 119288137354977880,1642104576551818747, 22707897424654348214,315300786621008803900] |