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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 432 |
| 3 | 45960 |
| 4 | 5780034 |
| 5 | 797957244 |
| 6 | 116916528960 |
| 7 | 17852845828752 |
| 8 | 2810058672255120 |
| 9 | 452703723158137776 |
| 10 | 74282858140993920000 |
| 11 | 12371608762947252317376 |
| 12 | 2085965999078265151837416 |
| 13 | 355369363809372393287259600 |
| 14 | 61077516024443872565938037760 |
| 15 | 10577549099569850669961138879936 |
| 16 | 1844022794086994489463720605589954 |
| 17 | 323353325204017719895246887849230460 |
[1,6,432,45960,5780034,797957244,116916528960, 17852845828752,2810058672255120, 452703723158137776,74282858140993920000, 12371608762947252317376,2085965999078265151837416, 355369363809372393287259600, 61077516024443872565938037760, 10577549099569850669961138879936, 1844022794086994489463720605589954, 323353325204017719895246887849230460] |