n | a(n) |
---|---|
1 | 4 |
2 | 16 |
3 | 60 |
4 | 224 |
5 | 820 |
6 | 2976 |
7 | 10700 |
8 | 38224 |
9 | 135780 |
10 | 480176 |
11 | 1691740 |
12 | 5941824 |
13 | 20814740 |
14 | 72755776 |
15 | 253836780 |
16 | 884207024 |
17 | 3075861700 |
18 | 10687549776 |
19 | 37098781820 |
20 | 128668433824 |
21 | 445930140660 |
22 | 1544500542176 |
23 | 5346546062860 |
24 | 18499277662224 |
[4,16,60,224,820,2976,10700,38224,135780,480176, 1691740,5941824,20814740,72755776,253836780, 884207024,3075861700,10687549776,37098781820, 128668433824,445930140660,1544500542176, 5346546062860,18499277662224] |