n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 14 |
5 | 65 |
6 | 370 |
7 | 2496 |
8 | 19339 |
9 | 169215 |
10 | 1649844 |
11 | 17735823 |
12 | 208395916 |
13 | 2657047924 |
14 | 36534408954 |
15 | 538882532061 |
16 | 8487399879955 |
17 | 142163947989233 |
18 | 2523410076808877 |
19 | 47313938940166439 |
20 | 934450294068287158 |
[1,1,2,4,14,65,370,2496,19339,169215,1649844, 17735823,208395916,2657047924,36534408954, 538882532061,8487399879955,142163947989233, 2523410076808877,47313938940166439, 934450294068287158] |