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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 560 |
| 4 | 68642 |
| 5 | 34215232 |
| 6 | 69224885118 |
| 7 | 564395560679680 |
| 8 | 18462516899827251202 |
| 9 | 2418515872778936155907072 |
| 10 | 1267759411784533615311138990078 |
| 11 | 2658525714048411732541898289615687680 |
| 12 | 22300920657959489563024348304023741280501762 |
| 13 | 748290577775586983580548698483165497859690809475072 |
| 14 | 100433695860518615261304925954158931177362414164610493153278 |
| 15 | 53919903879834365544910698161440014555837394338328471823987820789760 |
[1,2,18,560,68642,34215232,69224885118, 564395560679680,18462516899827251202, 2418515872778936155907072, 1267759411784533615311138990078, 2658525714048411732541898289615687680, 22300920657959489563024348304023741280501762, 74829057777558698358054869848316549785969080947507\ 2, 10043369586051861526130492595415893117736241416461\ 0493153278, 53919903879834365544910698161440014555837394338328\ 471823987820789760] |