n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 57 |
5 | 306 |
6 | 1807 |
7 | 11538 |
8 | 78739 |
9 | 569533 |
10 | 4339187 |
11 | 34654038 |
12 | 288981540 |
13 | 2508261208 |
14 | 22599555849 |
15 | 210891194677 |
16 | 2034166628300 |
17 | 20245403842599 |
18 | 207589233294167 |
19 | 2189866971393096 |
20 | 23736645165616944 |
21 | 264066371438676327 |
[1,1,3,12,57,306,1807,11538,78739,569533,4339187, 34654038,288981540,2508261208,22599555849, 210891194677,2034166628300,20245403842599, 207589233294167,2189866971393096, 23736645165616944,264066371438676327] |