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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 13 |
| 7 | 37 |
| 8 | 190 |
| 9 | 798 |
| 10 | 5458 |
| 11 | 43604 |
| 12 | 402857 |
| 13 | 5033744 |
| 14 | 71523854 |
| 15 | 1310467409 |
| 16 | 28108624809 |
[1,13,37,190,798,5458,43604,402857,5033744, 71523854,1310467409,28108624809] |