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| n | a(n) |
|---|---|
| 1 | 344 |
| 2 | 2064 |
| 3 | 12600 |
| 4 | 78420 |
| 5 | 477144 |
| 6 | 2908188 |
| 7 | 17766000 |
| 8 | 110572200 |
| 9 | 672773040 |
| 10 | 4100545080 |
| 11 | 25050060000 |
| 12 | 155906802000 |
| 13 | 948609986400 |
| 14 | 5781768562800 |
| 15 | 35320584600000 |
| 16 | 219828590820000 |
| 17 | 1337540080824000 |
| 18 | 8152293673548000 |
[344,2064,12600,78420,477144,2908188,17766000, 110572200,672773040,4100545080,25050060000, 155906802000,948609986400,5781768562800, 35320584600000,219828590820000,1337540080824000, 8152293673548000] |