n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 18 |
5 | 50 |
6 | 195 |
7 | 392 |
8 | 1652 |
9 | 2970 |
10 | 12825 |
11 | 22022 |
12 | 96030 |
13 | 160888 |
14 | 705341 |
15 | 1162800 |
16 | 5116200 |
17 | 8335338 |
18 | 36773397 |
19 | 59366450 |
20 | 262462010 |
21 | 420630210 |
22 | 1862790699 |
23 | 2967563040 |
24 | 13160496684 |
25 | 20861295000 |
26 | 92624149475 |
27 | 146203657992 |
28 | 649794035142 |
29 | 1021964428880 |
[1,1,1,6,18,50,195,392,1652,2970,12825,22022, 96030,160888,705341,1162800,5116200,8335338, 36773397,59366450,262462010,420630210,1862790699, 2967563040,13160496684,20861295000,92624149475, 146203657992,649794035142,1021964428880] |