n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 22 |
6 | 58 |
7 | 164 |
8 | 496 |
9 | 1601 |
10 | 5502 |
11 | 20075 |
12 | 77531 |
13 | 315947 |
14 | 1354279 |
15 | 6087421 |
16 | 28611385 |
17 | 140239297 |
18 | 715116827 |
19 | 3785445032 |
20 | 20760746393 |
21 | 117759236340 |
22 | 689745339984 |
23 | 4165874930885 |
24 | 25911148634728 |
25 | 165775085602106 |
26 | 1089773992530717 |
27 | 7353740136527305 |
[1,1,2,4,9,22,58,164,496,1601,5502,20075,77531, 315947,1354279,6087421,28611385,140239297, 715116827,3785445032,20760746393,117759236340, 689745339984,4165874930885,25911148634728, 165775085602106,1089773992530717,7353740136527305] |