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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 90 |
| 4 | 1441 |
| 5 | 38325 |
| 6 | 916714 |
| 7 | 37830100 |
| 8 | 1194352181 |
| 9 | 45241845825 |
| 10 | 1951734678972 |
| 11 | 147430334155104 |
| 12 | 5664495439368403 |
| 13 | 528359397843879784 |
| 14 | 30798685780200874044 |
| 15 | 1774211038440007650672 |
| 16 | 99969666291681633988821 |
| 17 | 13249072759407029981640765 |
| 18 | 847264606120975715873578180 |
[1,7,90,1441,38325,916714,37830100,1194352181, 45241845825,1951734678972,147430334155104, 5664495439368403,528359397843879784, 30798685780200874044,1774211038440007650672, 99969666291681633988821, 13249072759407029981640765, 847264606120975715873578180] |