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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 75 |
| 4 | 572 |
| 5 | 6293 |
| 6 | 92962 |
| 7 | 1395180 |
| 8 | 25482135 |
| 9 | 582310475 |
| 10 | 13697614020 |
| 11 | 364311810217 |
| 12 | 11551145067139 |
| 13 | 380339218683310 |
| 14 | 13636394439014770 |
| 15 | 563142483841155427 |
| 16 | 24264229405883569164 |
| 17 | 1114389674994185476663 |
[1,2,10,75,572,6293,92962,1395180,25482135, 582310475,13697614020,364311810217,11551145067139, 380339218683310,13636394439014770, 563142483841155427,24264229405883569164, 1114389674994185476663] |