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A210902 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 252 |
| 5 | 6328 |
| 6 | 297609 |
| 7 | 25886499 |
| 8 | 4205102578 |
| 9 | 1265408306700 |
| 10 | 707818003940086 |
| 11 | 733897633220152333 |
| 12 | 1410044723992401143016 |
[1,3,17,252,6328,297609,25886499,4205102578, 1265408306700,707818003940086,733897633220152333, 1410044723992401143016] |