n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 42 |
3 | 198 |
4 | 1068 |
5 | 5196 |
6 | 25902 |
7 | 125874 |
8 | 609780 |
9 | 2933562 |
10 | 14058132 |
11 | 67139772 |
12 | 319822572 |
13 | 1520161374 |
14 | 7211880744 |
15 | 34157352042 |
16 | 161541458514 |
17 | 763007236542 |
18 | 3599867690610 |
[1,6,42,198,1068,5196,25902,125874,609780,2933562, 14058132,67139772,319822572,1520161374,7211880744, 34157352042,161541458514,763007236542, 3599867690610] |