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| n | a(n) |
|---|---|
| 1 | 71 |
| 2 | 562 |
| 3 | 4459 |
| 4 | 35381 |
| 5 | 280728 |
| 6 | 2227408 |
| 7 | 17673153 |
| 8 | 140225934 |
| 9 | 1112609193 |
| 10 | 8827890666 |
| 11 | 70044049696 |
| 12 | 555757777662 |
| 13 | 4409606651432 |
| 14 | 34987599997513 |
| 15 | 277605748165393 |
| 16 | 2202636117365747 |
| 17 | 17476604492474532 |
| 18 | 138666437991429781 |
[71,562,4459,35381,280728,2227408,17673153, 140225934,1112609193,8827890666,70044049696, 555757777662,4409606651432,34987599997513, 277605748165393,2202636117365747, 17476604492474532,138666437991429781] |