| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 53 |
| 4 | 345 |
| 5 | 2947 |
| 6 | 31411 |
| 7 | 400437 |
| 8 | 5927921 |
| 9 | 99816515 |
| 10 | 1882741659 |
| 11 | 39310397557 |
| 12 | 899919305929 |
| 13 | 22410922177347 |
| 14 | 603120939234755 |
| 15 | 17441737474345973 |
| 16 | 539390080299331809 |
| 17 | 17762381612118471043 |
[1,3,11,53,345,2947,31411,400437,5927921,99816515, 1882741659,39310397557,899919305929, 22410922177347,603120939234755,17441737474345973, 539390080299331809,17762381612118471043] |