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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 51 |
| 3 | 423 |
| 4 | 3334 |
| 5 | 25647 |
| 6 | 200376 |
| 7 | 1574278 |
| 8 | 12334824 |
| 9 | 96480571 |
| 10 | 755212375 |
| 11 | 5914093280 |
| 12 | 46306103745 |
| 13 | 362524633360 |
| 14 | 2838264260603 |
| 15 | 22221912955624 |
| 16 | 173982894127917 |
| 17 | 1362160216940837 |
| 18 | 10664747935404835 |
| 19 | 83497581682654109 |
[7,51,423,3334,25647,200376,1574278,12334824, 96480571,755212375,5914093280,46306103745, 362524633360,2838264260603,22221912955624, 173982894127917,1362160216940837, 10664747935404835,83497581682654109] |