n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 14 |
6 | 48 |
7 | 165 |
8 | 568 |
9 | 1954 |
10 | 6717 |
11 | 23082 |
12 | 79307 |
13 | 272470 |
14 | 936065 |
15 | 3215741 |
16 | 11047122 |
17 | 37950140 |
18 | 130369334 |
19 | 447853808 |
20 | 1538496047 |
21 | 5285135093 |
22 | 18155807539 |
23 | 62369881206 |
24 | 214256590058 |
25 | 736026444181 |
26 | 2528439830821 |
[0,0,1,4,14,48,165,568,1954,6717,23082,79307, 272470,936065,3215741,11047122,37950140,130369334, 447853808,1538496047,5285135093,18155807539, 62369881206,214256590058,736026444181, 2528439830821] |