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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 870 |
| 3 | 25230 |
| 4 | 731670 |
| 5 | 21218430 |
| 6 | 615334470 |
| 7 | 17844699630 |
| 8 | 517496289270 |
| 9 | 15007392388830 |
| 10 | 435214379276070 |
| 11 | 12621216999006030 |
| 12 | 366015292971174435 |
| 13 | 10614443496164046000 |
| 14 | 307818861388756968600 |
| 15 | 8926746980273941492800 |
[1,30,870,25230,731670,21218430,615334470, 17844699630,517496289270,15007392388830, 435214379276070,12621216999006030, 366015292971174435,10614443496164046000, 307818861388756968600,8926746980273941492800] |