n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 25 |
6 | 66 |
7 | 173 |
8 | 460 |
9 | 1218 |
10 | 3240 |
11 | 8602 |
12 | 22878 |
13 | 60794 |
14 | 161668 |
15 | 429752 |
16 | 1142758 |
17 | 3038173 |
18 | 8078606 |
19 | 21479469 |
20 | 57113888 |
[1,1,2,4,10,25,66,173,460,1218,3240,8602,22878, 60794,161668,429752,1142758,3038173,8078606, 21479469,57113888] |