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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 20 |
| 2 | 35588 |
| 3 | 298222584 |
| 4 | 6893041104320 |
| 5 | 339390744700600960 |
| 6 | 30545941969311603920448 |
| 7 | 4541087129383087067300766208 |
| 8 | 1037530290355966843503848621711360 |
| 9 | 345178211314328731754914550691807848448 |
| 10 | 160358051712882281911114847531779916283438080 |
| 11 | 100600852780499610741720532655118892927017005940736 |
[1,20,35588,298222584,6893041104320, 339390744700600960,30545941969311603920448, 4541087129383087067300766208, 1037530290355966843503848621711360, 345178211314328731754914550691807848448, 160358051712882281911114847531779916283438080, 10060085278049961074172053265511889292701700594073\ 6] |