n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 22 |
5 | 86 |
6 | 336 |
7 | 1290 |
8 | 4870 |
9 | 18164 |
10 | 67234 |
11 | 247786 |
12 | 911120 |
13 | 3346618 |
14 | 12286942 |
15 | 45104548 |
16 | 165573482 |
17 | 607817410 |
18 | 2231360192 |
19 | 8191763970 |
20 | 30074097062 |
21 | 110410946820 |
22 | 405353571346 |
23 | 1488185247962 |
24 | 5463619641904 |
25 | 20058759689642 |
26 | 73642362774478 |
27 | 270365534734372 |
[1,2,6,22,86,336,1290,4870,18164,67234,247786, 911120,3346618,12286942,45104548,165573482, 607817410,2231360192,8191763970,30074097062, 110410946820,405353571346,1488185247962, 5463619641904,20058759689642,73642362774478, 270365534734372] |