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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 511 |
| 10 | 174251 |
| 11 | 50955971 |
| 12 | 13910980083 |
| 13 | 3675639930963 |
| 14 | 955841412523283 |
| 15 | 246614610741341843 |
| 16 | 63379954960524853651 |
| 17 | 16256896431763117598611 |
| 18 | 4165817792093527797314451 |
| 19 | 1066968301301093995246996371 |
| 20 | 273210326382611632738979052435 |
[1,511,174251,50955971,13910980083,3675639930963, 955841412523283,246614610741341843, 63379954960524853651,16256896431763117598611, 4165817792093527797314451, 1066968301301093995246996371, 273210326382611632738979052435] |