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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 114 |
| 4 | 680 |
| 5 | 6064 |
| 6 | 62776 |
| 7 | 518560 |
| 8 | 4854740 |
| 9 | 47329800 |
| 10 | 436295060 |
| 11 | 4163000530 |
| 12 | 40224691008 |
| 13 | 383919683336 |
| 14 | 3702037559404 |
| 15 | 35864644194258 |
| 16 | 346836775041832 |
| 17 | 3366637367524806 |
| 18 | 32752033994479420 |
| 19 | 318790073410891420 |
[1,10,114,680,6064,62776,518560,4854740,47329800, 436295060,4163000530,40224691008,383919683336, 3702037559404,35864644194258,346836775041832, 3366637367524806,32752033994479420, 318790073410891420] |