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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 19 |
| 7 | 246 |
| 8 | 2767 |
| 9 | 29384 |
| 10 | 305646 |
| 11 | 3170684 |
| 12 | 33104118 |
| 13 | 349462727 |
| 14 | 3738073247 |
| 15 | 40549242195 |
| 16 | 446115153023 |
| 17 | 4976319258200 |
| 18 | 56252653681606 |
| 19 | 643996994735079 |
| 20 | 7461850038335967 |
| 21 | 87447167319345337 |
| 22 | 1035866799853591309 |
| 23 | 12395264890256322913 |
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