n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 17 |
5 | 56 |
6 | 205 |
7 | 690 |
8 | 2446 |
9 | 8506 |
10 | 30429 |
11 | 109449 |
12 | 402486 |
13 | 1501424 |
14 | 5714194 |
15 | 22132604 |
16 | 87383864 |
17 | 351373406 |
18 | 1439320606 |
19 | 6003166059 |
20 | 25488902820 |
21 | 110125079184 |
22 | 483987225922 |
23 | 2162799298162 |
24 | 9823464989574 |
25 | 45332196378784 |
26 | 212459227340403 |
27 | 1010898241558627 |
28 | 4881398739414159 |
[1,0,1,4,17,56,205,690,2446,8506,30429,109449, 402486,1501424,5714194,22132604,87383864, 351373406,1439320606,6003166059,25488902820, 110125079184,483987225922,2162799298162, 9823464989574,45332196378784,212459227340403, 1010898241558627,4881398739414159] |