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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 34 |
| 4 | 295 |
| 5 | 3421 |
| 6 | 50109 |
| 7 | 873653 |
| 8 | 17651130 |
| 9 | 405071647 |
| 10 | 10405074777 |
| 11 | 295716745389 |
| 12 | 9211817240589 |
| 13 | 312086923832843 |
| 14 | 11424093750214407 |
| 15 | 449317984131076935 |
| 16 | 18896062057857406028 |
| 17 | 846136323944194170206 |
| 18 | 40192544399241119212807 |
[1,6,34,295,3421,50109,873653,17651130,405071647, 10405074777,295716745389,9211817240589, 312086923832843,11424093750214407, 449317984131076935,18896062057857406028, 846136323944194170206,40192544399241119212807] |