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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 990 |
| 3 | 33660 |
| 4 | 1161270 |
| 5 | 40412196 |
| 6 | 1414426860 |
| 7 | 49707001080 |
| 8 | 1752171788070 |
| 9 | 61910069845140 |
| 10 | 2191616472517956 |
| 11 | 77702765843818440 |
| 12 | 2758448187455554620 |
| 13 | 98031004815728171880 |
| 14 | 3487102885588044971160 |
[1,30,990,33660,1161270,40412196,1414426860, 49707001080,1752171788070,61910069845140, 2191616472517956,77702765843818440, 2758448187455554620,98031004815728171880, 3487102885588044971160] |