n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 26 |
4 | 84 |
5 | 250 |
6 | 747 |
7 | 2182 |
8 | 6323 |
9 | 18132 |
10 | 51624 |
11 | 146004 |
12 | 410677 |
13 | 1149578 |
14 | 3204477 |
15 | 8899502 |
16 | 24634620 |
17 | 67990414 |
18 | 187154271 |
19 | 513939214 |
20 | 1408246247 |
21 | 3851081256 |
22 | 10512259920 |
23 | 28647203880 |
24 | 77946605545 |
25 | 211782868754 |
[1,2,9,26,84,250,747,2182,6323,18132,51624,146004, 410677,1149578,3204477,8899502,24634620,67990414, 187154271,513939214,1408246247,3851081256, 10512259920,28647203880,77946605545,211782868754] |