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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 106 |
| 4 | 1949 |
| 5 | 47376 |
| 6 | 1443757 |
| 7 | 53003392 |
| 8 | 2278044729 |
| 9 | 112267072000 |
| 10 | 6242682602321 |
| 11 | 386708915902464 |
| 12 | 26411820455554261 |
| 13 | 1971959747016534016 |
| 14 | 159794005364013403125 |
| 15 | 13967707431203856449536 |
| 16 | 1310083060716906045342833 |
| 17 | 131245686122586065682628608 |
[1,1,9,106,1949,47376,1443757,53003392,2278044729, 112267072000,6242682602321,386708915902464, 26411820455554261,1971959747016534016, 159794005364013403125,13967707431203856449536, 1310083060716906045342833, 131245686122586065682628608] |