| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 37 |
| 5 | 182 |
| 6 | 1039 |
| 7 | 7149 |
| 8 | 56382 |
| 9 | 479220 |
| 10 | 4280247 |
| 11 | 40406984 |
| 12 | 410453366 |
| 13 | 4539623168 |
| 14 | 54431372233 |
| 15 | 695801259947 |
| 16 | 9312538336475 |
| 17 | 128985882874288 |
| 18 | 1842668013046405 |
| 19 | 27238267120063415 |
| 20 | 419396473955088310 |
| 21 | 6769168354222927254 |
| 22 | 114837651830425810381 |
| 23 | 2042782103293394499566 |
[1,1,2,8,37,182,1039,7149,56382,479220,4280247, 40406984,410453366,4539623168,54431372233, 695801259947,9312538336475,128985882874288, 1842668013046405,27238267120063415, 419396473955088310,6769168354222927254, 114837651830425810381,2042782103293394499566] |