n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 146 |
4 | 714 |
5 | 3534 |
6 | 17718 |
7 | 89898 |
8 | 461010 |
9 | 2386390 |
10 | 12455118 |
11 | 65478978 |
12 | 346448538 |
13 | 1843520670 |
14 | 9859734630 |
15 | 52974158938 |
16 | 285791932578 |
17 | 1547585781414 |
18 | 8408765223294 |
[1,6,30,146,714,3534,17718,89898,461010,2386390, 12455118,65478978,346448538,1843520670,9859734630, 52974158938,285791932578,1547585781414, 8408765223294] |