n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 38 |
4 | 240 |
5 | 1516 |
6 | 9576 |
7 | 60488 |
8 | 382080 |
9 | 2413456 |
10 | 15244896 |
11 | 96296288 |
12 | 608267520 |
13 | 3842197696 |
14 | 24269721216 |
15 | 153302722688 |
16 | 968355778560 |
17 | 6116740116736 |
18 | 38637152257536 |
19 | 244056393778688 |
20 | 1541612667187200 |
[0,1,6,38,240,1516,9576,60488,382080,2413456, 15244896,96296288,608267520,3842197696, 24269721216,153302722688,968355778560, 6116740116736,38637152257536,244056393778688, 1541612667187200] |