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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 37 |
| 4 | 305 |
| 5 | 3435 |
| 6 | 50163 |
| 7 | 873713 |
| 8 | 17651465 |
| 9 | 405072044 |
| 10 | 10405078324 |
| 11 | 295716748946 |
| 12 | 9211817291426 |
| 13 | 312086923883692 |
| 14 | 11424093751088836 |
| 15 | 449317984131957736 |
| 16 | 18896062057875064856 |
| 17 | 846136323944211829050 |
| 18 | 40192544399241524385636 |
[1,7,37,305,3435,50163,873713,17651465,405072044, 10405078324,295716748946,9211817291426, 312086923883692,11424093751088836, 449317984131957736,18896062057875064856, 846136323944211829050,40192544399241524385636] |