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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 27 |
| 10 | 435 |
| 11 | 5456 |
| 12 | 58905 |
| 13 | 575757 |
| 14 | 5245786 |
| 15 | 45379620 |
| 16 | 377348994 |
| 17 | 3042312350 |
| 18 | 23930713170 |
| 19 | 184509266760 |
| 20 | 1399358844975 |
| 21 | 10468434365991 |
| 22 | 77413632286320 |
| 23 | 566877686933536 |
| 24 | 4116305022165108 |
| 25 | 29673694525643100 |
| 26 | 212566476905162380 |
| 27 | 1514334254464231200 |
| 28 | 10735998891545372445 |
[1,27,435,5456,58905,575757,5245786,45379620, 377348994,3042312350,23930713170,184509266760, 1399358844975,10468434365991,77413632286320, 566877686933536,4116305022165108, 29673694525643100,212566476905162380, 1514334254464231200,10735998891545372445] |