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| n | a(n) |
|---|---|
| 1 | 297 |
| 2 | 2193 |
| 3 | 12954 |
| 4 | 94706 |
| 5 | 577942 |
| 6 | 4109933 |
| 7 | 25654154 |
| 8 | 178853600 |
| 9 | 1134888362 |
| 10 | 7800498387 |
| 11 | 50090230067 |
| 12 | 340784782367 |
| 13 | 2207291572071 |
| 14 | 14906727029792 |
| 15 | 97157151617639 |
| 16 | 652654217958931 |
| 17 | 4273049848255227 |
| 18 | 28593960218535652 |
[297,2193,12954,94706,577942,4109933,25654154, 178853600,1134888362,7800498387,50090230067, 340784782367,2207291572071,14906727029792, 97157151617639,652654217958931,4273049848255227, 28593960218535652] |