n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 6 |
4 | 31 |
5 | 126 |
6 | 589 |
7 | 2772 |
8 | 13485 |
9 | 66780 |
10 | 336207 |
11 | 1714698 |
12 | 8841627 |
13 | 46015002 |
14 | 241394073 |
15 | 1275137448 |
16 | 6776728825 |
17 | 36208438488 |
18 | 194388488155 |
19 | 1048061471886 |
20 | 5672504958327 |
21 | 30808982057046 |
22 | 167864115588325 |
23 | 917271225518076 |
24 | 5025659929354981 |
[1,0,3,6,31,126,589,2772,13485,66780,336207, 1714698,8841627,46015002,241394073,1275137448, 6776728825,36208438488,194388488155,1048061471886, 5672504958327,30808982057046,167864115588325, 917271225518076,5025659929354981] |