n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 22 |
5 | 78 |
6 | 245 |
7 | 750 |
8 | 2057 |
9 | 5597 |
10 | 14884 |
11 | 38975 |
12 | 101629 |
13 | 264239 |
14 | 687007 |
15 | 1801533 |
16 | 4744920 |
17 | 12604009 |
18 | 33763684 |
19 | 91210364 |
[0,0,3,22,78,245,750,2057,5597,14884,38975,101629, 264239,687007,1801533,4744920,12604009,33763684, 91210364] |