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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 27 |
| 3 | 297 |
| 4 | 24570 |
| 5 | 267030 |
| 6 | 22064157 |
| 7 | 239792967 |
| 8 | 19813588740 |
| 9 | 215333817660 |
| 10 | 17792580624687 |
| 11 | 193369528466037 |
| 12 | 15977717587380510 |
| 13 | 173645621228683890 |
| 14 | 14347972600887073617 |
| 15 | 155933574493829667507 |
| 16 | 12884463417879004727880 |
| 17 | 140028176249837812737720 |
[0,27,297,24570,267030,22064157,239792967, 19813588740,215333817660,17792580624687, 193369528466037,15977717587380510, 173645621228683890,14347972600887073617, 155933574493829667507,12884463417879004727880, 140028176249837812737720] |