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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 16 |
| 4 | 193 |
| 5 | 19449 |
| 6 | 2535368 |
| 7 | 1436535356 |
| 8 | 2099296647197 |
| 9 | 9043086011797968 |
| 10 | 109561680407727718539 |
[1,1,16,193,19449,2535368,1436535356, 2099296647197,9043086011797968, 109561680407727718539] |