n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 18 |
6 | 39 |
7 | 89 |
8 | 195 |
9 | 415 |
10 | 865 |
11 | 1823 |
12 | 3787 |
13 | 7869 |
14 | 16230 |
15 | 33352 |
16 | 68422 |
17 | 140013 |
18 | 285991 |
19 | 583235 |
20 | 1187718 |
[0,1,2,8,18,39,89,195,415,865,1823,3787,7869, 16230,33352,68422,140013,285991,583235,1187718] |