n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 9 |
7 | 31 |
8 | 128 |
9 | 708 |
10 | 4015 |
11 | 24865 |
12 | 177444 |
13 | 1357830 |
14 | 11141634 |
15 | 99680595 |
16 | 953369248 |
17 | 9687797896 |
18 | 104909705019 |
19 | 1202985610821 |
20 | 14542305462860 |
21 | 185165060805578 |
22 | 2476043157780478 |
23 | 34673872424313463 |
[1,1,1,1,2,9,31,128,708,4015,24865,177444,1357830, 11141634,99680595,953369248,9687797896, 104909705019,1202985610821,14542305462860, 185165060805578,2476043157780478, 34673872424313463] |