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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 80 |
| 3 | 1040 |
| 4 | 5600 |
| 5 | 53680 |
| 6 | 123760 |
| 7 | 473280 |
| 8 | 825360 |
| 9 | 2145440 |
| 10 | 6837040 |
| 11 | 9543040 |
| 12 | 23114640 |
| 13 | 38618720 |
| 14 | 49002800 |
| 15 | 76448320 |
| 16 | 139398480 |
| 17 | 238308080 |
| 18 | 281532080 |
| 19 | 450041680 |
| 20 | 601409760 |
| 21 | 691023840 |
| 22 | 1025685440 |
| 23 | 1313013520 |
| 24 | 1861353120 |
[10,80,1040,5600,53680,123760,473280,825360, 2145440,6837040,9543040,23114640,38618720, 49002800,76448320,139398480,238308080,281532080, 450041680,601409760,691023840,1025685440, 1313013520,1861353120] |