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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 509 |
| 3 | 7688 |
| 4 | 105417 |
| 5 | 1368660 |
| 6 | 17211253 |
| 7 | 212371456 |
| 8 | 2591003393 |
| 9 | 31398579212 |
| 10 | 378973353837 |
| 11 | 4563240432504 |
| 12 | 54868960089529 |
| 13 | 659203880450884 |
| 14 | 7915910524882661 |
| 15 | 95029322307819632 |
| 16 | 1140621385518013425 |
[1,28,509,7688,105417,1368660,17211253,212371456, 2591003393,31398579212,378973353837,4563240432504, 54868960089529,659203880450884,7915910524882661, 95029322307819632,1140621385518013425] |