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| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 147 |
| 3 | 1041 |
| 4 | 10231 |
| 5 | 76355 |
| 6 | 639129 |
| 7 | 5262685 |
| 8 | 45272931 |
| 9 | 382928623 |
| 10 | 3284527183 |
| 11 | 28183944013 |
| 12 | 243625884229 |
| 13 | 2108556673765 |
| 14 | 18314858156217 |
| 15 | 159384230179203 |
| 16 | 1390406836401831 |
| 17 | 12149636212862815 |
| 18 | 106349025711686091 |
[19,147,1041,10231,76355,639129,5262685,45272931, 382928623,3284527183,28183944013,243625884229, 2108556673765,18314858156217,159384230179203, 1390406836401831,12149636212862815, 106349025711686091] |