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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 3846 |
| 3 | 1173512 |
| 4 | 439192790 |
| 5 | 184619047020 |
| 6 | 83659800759150 |
| 7 | 39956935830445136 |
| 8 | 19840440079542390102 |
| 9 | 10150867545062935511900 |
| 10 | 5318188148539280718247346 |
| 11 | 2840554565353471719458163720 |
| 12 | 1541655842245048541457829216574 |
[20,3846,1173512,439192790,184619047020, 83659800759150,39956935830445136, 19840440079542390102,10150867545062935511900, 5318188148539280718247346, 2840554565353471719458163720, 1541655842245048541457829216574] |