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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 53 |
| 5 | 712 |
| 6 | 24576 |
| 7 | 2275616 |
| 8 | 589543159 |
| 9 | 420188096140 |
| 10 | 819411181635025 |
| 11 | 4381819315336997184 |
| 12 | 64583749250393921183423 |
| 13 | 2638507778912832094660037006 |
| 14 | 300397569392490080058575760090548 |
| 15 | 95776592061550107555640978862165082446 |
[1,1,2,7,53,712,24576,2275616,589543159, 420188096140,819411181635025,4381819315336997184, 64583749250393921183423, 2638507778912832094660037006, 300397569392490080058575760090548, 95776592061550107555640978862165082446] |