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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 576 |
| 3 | 3992 |
| 4 | 26088 |
| 5 | 167892 |
| 6 | 1060410 |
| 7 | 6648825 |
| 8 | 41411637 |
| 9 | 257111073 |
| 10 | 1592383950 |
| 11 | 9849348220 |
| 12 | 60864784416 |
| 13 | 375923971008 |
| 14 | 2321047520028 |
| 15 | 14327865017369 |
| 16 | 88434810763449 |
| 17 | 545798500182681 |
| 18 | 3368378623889316 |
| 19 | 20787263257726248 |
[81,576,3992,26088,167892,1060410,6648825, 41411637,257111073,1592383950,9849348220, 60864784416,375923971008,2321047520028, 14327865017369,88434810763449,545798500182681, 3368378623889316,20787263257726248] |