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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 63900 |
| 3 | 63148000 |
| 4 | 85136103750 |
| 5 | 137629764435024 |
| 6 | 250331826090382280 |
| 7 | 494436455370401985600 |
| 8 | 1037731227148399567352625 |
| 9 | 2281874234819846601146115000 |
| 10 | 5205960892339635531670022801628 |
| 11 | 12237148815599682784939438806708960 |
| 12 | 29483782935554473122496294160376815950 |
[1,120,63900,63148000,85136103750,137629764435024, 250331826090382280,494436455370401985600, 1037731227148399567352625, 2281874234819846601146115000, 5205960892339635531670022801628, 12237148815599682784939438806708960, 29483782935554473122496294160376815950] |