n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 13 |
5 | 57 |
6 | 315 |
7 | 2057 |
8 | 15484 |
9 | 132317 |
10 | 1261560 |
11 | 13281295 |
12 | 153218597 |
13 | 1921565205 |
14 | 26008169266 |
15 | 377922606876 |
16 | 5871153031163 |
17 | 97096594212804 |
18 | 1702487540383101 |
19 | 31551431772637772 |
20 | 616331122530164638 |
[1,2,4,13,57,315,2057,15484,132317,1261560, 13281295,153218597,1921565205,26008169266, 377922606876,5871153031163,97096594212804, 1702487540383101,31551431772637772, 616331122530164638] |