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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 73 |
| 3 | 856 |
| 4 | 12148 |
| 5 | 159818 |
| 6 | 2218128 |
| 7 | 30771790 |
| 8 | 425710602 |
| 9 | 5901225887 |
| 10 | 81906890563 |
| 11 | 1136740659494 |
| 12 | 15777299597218 |
| 13 | 219003011443420 |
| 14 | 3040043574547156 |
| 15 | 42200212094991310 |
| 16 | 585805173715282824 |
| 17 | 8131923948348934992 |
[1,73,856,12148,159818,2218128,30771790,425710602, 5901225887,81906890563,1136740659494, 15777299597218,219003011443420,3040043574547156, 42200212094991310,585805173715282824, 8131923948348934992] |