n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 10 |
4 | 40 |
5 | 460 |
6 | 53590 |
7 | 718052410 |
8 | 128899816953780640 |
9 | 4153790702679538920955222740373360 |
10 | 4313494300416744426870901874924164733839903365825579313972159982440 |
[2,4,10,40,460,53590,718052410,128899816953780640, 4153790702679538920955222740373360, 43134943004167444268709018749241647338399033658255\ 79313972159982440] |