n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 3 |
7 | 15 |
8 | 79 |
9 | 474 |
10 | 3207 |
11 | 24087 |
12 | 198923 |
13 | 1791902 |
14 | 17484377 |
15 | 183707380 |
16 | 2067904033 |
17 | 24827519376 |
18 | 316694549817 |
19 | 4277112686513 |
20 | 60971132411393 |
21 | 914869422343564 |
22 | 14413525170009350 |
23 | 237888443951757586 |
24 | 4104608160094692304 |
[0,0,0,0,1,3,15,79,474,3207,24087,198923,1791902, 17484377,183707380,2067904033,24827519376, 316694549817,4277112686513,60971132411393, 914869422343564,14413525170009350, 237888443951757586,4104608160094692304] |