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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 504 |
| 4 | 3976 |
| 5 | 31304 |
| 6 | 246232 |
| 7 | 1934856 |
| 8 | 15190840 |
| 9 | 119174216 |
| 10 | 934305400 |
| 11 | 7320389832 |
| 12 | 57325443448 |
| 13 | 448697920328 |
| 14 | 3510562344184 |
| 15 | 27455875247304 |
| 16 | 214658236385656 |
| 17 | 1677757456358984 |
| 18 | 13109740539632632 |
| 19 | 102412911071378376 |
[8,64,504,3976,31304,246232,1934856,15190840, 119174216,934305400,7320389832,57325443448, 448697920328,3510562344184,27455875247304, 214658236385656,1677757456358984, 13109740539632632,102412911071378376] |