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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 47 |
| 3 | 337 |
| 4 | 2399 |
| 5 | 16787 |
| 6 | 117643 |
| 7 | 823541 |
| 8 | 5764799 |
| 9 | 40353601 |
| 10 | 282475241 |
| 11 | 1977326699 |
| 12 | 13841287199 |
| 13 | 96889010371 |
| 14 | 678223072817 |
| 15 | 4747561509941 |
| 16 | 33232930569577 |
| 17 | 232630513987171 |
| 18 | 1628413597910399 |
| 19 | 11398895185373051 |
[7,47,337,2399,16787,117643,823541,5764799, 40353601,282475241,1977326699,13841287199, 96889010371,678223072817,4747561509941, 33232930569577,232630513987171,1628413597910399, 11398895185373051] |