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| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 3436 |
| 3 | 22728 |
| 4 | 148004 |
| 5 | 977192 |
| 6 | 6446656 |
| 7 | 42580424 |
| 8 | 281186200 |
| 9 | 1857372144 |
| 10 | 12268544428 |
| 11 | 81040372600 |
| 12 | 535313103052 |
| 13 | 3536037360504 |
| 14 | 23357456516908 |
| 15 | 154288871288536 |
| 16 | 1019162914084204 |
| 17 | 6732132852099864 |
| 18 | 44469447874930540 |
[512,3436,22728,148004,977192,6446656,42580424, 281186200,1857372144,12268544428,81040372600, 535313103052,3536037360504,23357456516908, 154288871288536,1019162914084204,6732132852099864, 44469447874930540] |