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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 69 |
| 4 | 794 |
| 5 | 9976 |
| 6 | 132657 |
| 7 | 1835406 |
| 8 | 26149390 |
| 9 | 381047316 |
| 10 | 5652729938 |
| 11 | 85083226696 |
| 12 | 1296149152770 |
| 13 | 19946485967765 |
| 14 | 309623839343190 |
| 15 | 4842246124795062 |
| 16 | 76223652657288606 |
| 17 | 1206767364167388590 |
| 18 | 19202880705976262634 |
| 19 | 306959907226679676021 |
| 20 | 4926844631755358159974 |
[1,1,7,69,794,9976,132657,1835406,26149390, 381047316,5652729938,85083226696,1296149152770, 19946485967765,309623839343190,4842246124795062, 76223652657288606,1206767364167388590, 19202880705976262634,306959907226679676021, 4926844631755358159974] |