n | a(n) |
---|---|
1 | 6 |
2 | 30 |
3 | 142 |
4 | 660 |
5 | 3042 |
6 | 13890 |
7 | 63260 |
8 | 287514 |
9 | 1305394 |
10 | 5924042 |
11 | 26877500 |
12 | 121920302 |
13 | 553009230 |
14 | 2508114154 |
15 | 11375127276 |
16 | 51589452156 |
[6,30,142,660,3042,13890,63260,287514,1305394, 5924042,26877500,121920302,553009230,2508114154, 11375127276,51589452156] |