n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 18 |
5 | 65 |
6 | 346 |
7 | 1288 |
8 | 6818 |
9 | 25518 |
10 | 136152 |
11 | 510532 |
12 | 2745347 |
13 | 10309234 |
14 | 55784794 |
15 | 209766714 |
16 | 1140670242 |
17 | 4294635438 |
18 | 23445204441 |
[1,3,18,65,346,1288,6818,25518,136152,510532, 2745347,10309234,55784794,209766714,1140670242, 4294635438,23445204441] |