n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 4 |
7 | 6 |
8 | 15 |
9 | 35 |
10 | 119 |
11 | 221 |
12 | 1703 |
13 | 31571 |
14 | 444163 |
15 | 62571693 |
16 | 16130221953 |
17 | 31653658032799 |
18 | 1139752929797333269 |
19 | 190765682365696256860989 |
20 | 13391304481955883169111997465697 |
[1,1,1,1,2,4,6,15,35,119,221,1703,31571,444163, 62571693,16130221953,31653658032799, 1139752929797333269,190765682365696256860989, 13391304481955883169111997465697] |