n | a(n) |
---|---|
3 | 2 |
4 | 8 |
5 | 36 |
6 | 140 |
7 | 522 |
8 | 1920 |
9 | 7030 |
10 | 25704 |
11 | 94302 |
12 | 347488 |
13 | 1286460 |
14 | 4785300 |
15 | 17879352 |
16 | 67076096 |
17 | 252579600 |
18 | 954306220 |
19 | 3616552422 |
20 | 13743371072 |
21 | 52356648380 |
22 | 199909107900 |
23 | 764873459802 |
24 | 2932022620160 |
25 | 11258982291252 |
[2,8,36,140,522,1920,7030,25704,94302,347488, 1286460,4785300,17879352,67076096,252579600, 954306220,3616552422,13743371072,52356648380, 199909107900,764873459802,2932022620160, 11258982291252] |