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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 480 |
| 3 | 6420 |
| 4 | 99420 |
| 5 | 1572180 |
| 6 | 25422222 |
| 7 | 416454978 |
| 8 | 6885816564 |
| 9 | 114581515836 |
| 10 | 1915137946090 |
| 11 | 32108164577926 |
| 12 | 539443877987058 |
| 13 | 9076218410008338 |
| 14 | 152859785704323702 |
| 15 | 2576172883673109030 |
[1,30,480,6420,99420,1572180,25422222,416454978, 6885816564,114581515836,1915137946090, 32108164577926,539443877987058,9076218410008338, 152859785704323702,2576172883673109030] |