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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 226 |
| 4 | 15556 |
| 5 | 2941772 |
| 6 | 1527584784 |
| 7 | 2177623382864 |
| 8 | 8522206940566808 |
| 9 | 91558683282725300624 |
| 10 | 2700384338082047133898512 |
| 11 | 218639776300578162500042598232 |
| 12 | 48597088081320286927152305357894272 |
[1,9,226,15556,2941772,1527584784,2177623382864, 8522206940566808,91558683282725300624, 2700384338082047133898512, 218639776300578162500042598232, 48597088081320286927152305357894272] |