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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 252 |
| 5 | 3025 |
| 6 | 44406 |
| 7 | 770623 |
| 8 | 15434616 |
| 9 | 350420337 |
| 10 | 8893045900 |
| 11 | 249474767861 |
| 12 | 7665670072116 |
| 13 | 256045368531433 |
| 14 | 9237038259841770 |
| 15 | 357934480164387225 |
| 16 | 14827066792663179616 |
| 17 | 653843231295154192017 |
| 18 | 30581468519362170893784 |
| 19 | 1512123060477719223218791 |
[1,1,4,27,252,3025,44406,770623,15434616, 350420337,8893045900,249474767861,7665670072116, 256045368531433,9237038259841770, 357934480164387225,14827066792663179616, 653843231295154192017,30581468519362170893784, 1512123060477719223218791] |