n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 74 |
7 | 222 |
8 | 698 |
9 | 2264 |
10 | 7536 |
11 | 25600 |
12 | 88406 |
13 | 309440 |
14 | 1095354 |
15 | 3914340 |
16 | 14102324 |
17 | 51165004 |
18 | 186774368 |
19 | 685495334 |
20 | 2527957006 |
[1,1,2,4,10,26,74,222,698,2264,7536,25600,88406, 309440,1095354,3914340,14102324,51165004, 186774368,685495334,2527957006] |