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| n | a(n) |
|---|---|
| 1 | 280 |
| 2 | 18620 |
| 3 | 411264 |
| 4 | 804384 |
| 5 | 871416 |
| 6 | 1222144 |
| 7 | 1284192 |
| 8 | 164989440 |
| 9 | 270138960 |
| 10 | 318729600 |
| 11 | 326781000 |
| 12 | 396168192 |
| 13 | 481572000 |
| 14 | 623397600 |
| 15 | 675347400 |
| 16 | 995248800 |
| 17 | 3444711424 |
| 18 | 4426793280 |
| 19 | 307030348800 |
| 20 | 465036042240 |
| 21 | 880719036120 |
[280,18620,411264,804384,871416,1222144,1284192, 164989440,270138960,318729600,326781000,396168192, 481572000,623397600,675347400,995248800, 3444711424,4426793280,307030348800,465036042240, 880719036120] |