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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 180 |
| 3 | 233640 |
| 4 | 303264540 |
| 5 | 393637139280 |
| 6 | 510940703520900 |
| 7 | 663200639532988920 |
| 8 | 860833919173116097260 |
| 9 | 1117361763886065161254560 |
| 10 | 1450334708690193406192321620 |
| 11 | 1882533334518107155172472208200 |
| 12 | 2443526817869794397220462733921980 |
[0,180,233640,303264540,393637139280, 510940703520900,663200639532988920, 860833919173116097260,1117361763886065161254560, 1450334708690193406192321620, 1882533334518107155172472208200, 2443526817869794397220462733921980] |