n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 23 |
4 | 151 |
5 | 1075 |
6 | 8075 |
7 | 62996 |
8 | 505501 |
9 | 4145684 |
10 | 34594540 |
11 | 292794156 |
12 | 2507383158 |
13 | 21686318745 |
14 | 189162110341 |
15 | 1662142617881 |
16 | 14698913545378 |
17 | 130723572694407 |
18 | 1168419986539867 |
19 | 10490326933563842 |
20 | 94564400499455397 |
21 | 855552893388047193 |
[1,1,4,23,151,1075,8075,62996,505501,4145684, 34594540,292794156,2507383158,21686318745, 189162110341,1662142617881,14698913545378, 130723572694407,1168419986539867, 10490326933563842,94564400499455397, 855552893388047193] |