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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 35 |
| 4 | 312 |
| 5 | 3779 |
| 6 | 41590 |
| 7 | 474169 |
| 8 | 5342808 |
| 9 | 60450145 |
| 10 | 682988978 |
| 11 | 7720432691 |
| 12 | 87256315920 |
| 13 | 986227664411 |
| 14 | 11146765278382 |
| 15 | 125986353493225 |
| 16 | 1423957841588232 |
| 17 | 16094263592763889 |
| 18 | 181905138292910570 |
| 19 | 2055979904686591259 |
| 20 | 23237679087969620328 |
| 21 | 262643489044489470155 |
[1,1,2,35,312,3779,41590,474169,5342808,60450145, 682988978,7720432691,87256315920,986227664411, 11146765278382,125986353493225,1423957841588232, 16094263592763889,181905138292910570, 2055979904686591259,23237679087969620328, 262643489044489470155] |