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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1740 |
| 2 | 537720 |
| 3 | 65419940 |
| 4 | 4294151280 |
| 5 | 177895264572 |
| 6 | 5119371185000 |
| 7 | 109259589441300 |
| 8 | 1814050066625760 |
| 9 | 24302219374594220 |
| 10 | 270375654593997912 |
| 11 | 2557020836654166660 |
| 12 | 20954574496241030480 |
| 13 | 151203607836534870300 |
| 14 | 973793388127416054600 |
| 15 | 5662552322478694510836 |
[1,1740,537720,65419940,4294151280,177895264572, 5119371185000,109259589441300,1814050066625760, 24302219374594220,270375654593997912, 2557020836654166660,20954574496241030480, 151203607836534870300,973793388127416054600, 5662552322478694510836] |