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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 43 |
| 3 | 396 |
| 4 | 4565 |
| 5 | 64146 |
| 6 | 1073919 |
| 7 | 20996376 |
| 8 | 471081385 |
| 9 | 11947911966 |
| 10 | 338204687315 |
| 11 | 10570101018276 |
| 12 | 361458024882045 |
| 13 | 13421571912745386 |
| 14 | 537661560385125031 |
| 15 | 23108777539028187696 |
| 16 | 1060571767117824260945 |
| 17 | 51760585513634983767606 |
[1,6,43,396,4565,64146,1073919,20996376,471081385, 11947911966,338204687315,10570101018276, 361458024882045,13421571912745386, 537661560385125031,23108777539028187696, 1060571767117824260945,51760585513634983767606] |