n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 31 |
4 | 120 |
5 | 418 |
6 | 1268 |
7 | 3499 |
8 | 8987 |
9 | 22316 |
10 | 51677 |
11 | 116978 |
12 | 252856 |
13 | 528275 |
14 | 1075319 |
15 | 2131671 |
16 | 4119410 |
17 | 7801334 |
18 | 14482059 |
[1,6,31,120,418,1268,3499,8987,22316,51677,116978, 252856,528275,1075319,2131671,4119410,7801334, 14482059] |