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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 70 |
| 4 | 868 |
| 5 | 11746 |
| 6 | 169022 |
| 7 | 2533895 |
| 8 | 39156244 |
| 9 | 619261762 |
| 10 | 9974917309 |
| 11 | 163078496420 |
| 12 | 2699109217420 |
| 13 | 45136794135853 |
| 14 | 761492594770649 |
| 15 | 12944937176754422 |
| 16 | 221518183089901621 |
| 17 | 3812823547509811611 |
| 18 | 65966582592220602621 |
| 19 | 1146568019260356348978 |
[0,1,7,70,868,11746,169022,2533895,39156244, 619261762,9974917309,163078496420,2699109217420, 45136794135853,761492594770649,12944937176754422, 221518183089901621,3812823547509811611, 65966582592220602621,1146568019260356348978] |