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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 73 |
| 5 | 626 |
| 6 | 8052 |
| 7 | 117650 |
| 8 | 2113665 |
| 9 | 43053283 |
| 10 | 1001953638 |
| 11 | 25937424602 |
| 12 | 743375541244 |
| 13 | 23298085122482 |
| 14 | 793811662272744 |
| 15 | 29192932133689220 |
| 16 | 1152956690052710401 |
| 17 | 48661191875666868482 |
| 18 | 2185928253847184914509 |
[1,3,10,73,626,8052,117650,2113665,43053283, 1001953638,25937424602,743375541244, 23298085122482,793811662272744,29192932133689220, 1152956690052710401,48661191875666868482, 2185928253847184914509] |