n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 57 |
6 | 188 |
7 | 651 |
8 | 2336 |
9 | 8719 |
10 | 33741 |
11 | 135185 |
12 | 559908 |
13 | 2394326 |
14 | 10557283 |
15 | 47943126 |
16 | 223987316 |
17 | 1075455181 |
18 | 5301593544 |
19 | 26807904317 |
20 | 138924912857 |
21 | 737220195148 |
22 | 4002876571636 |
23 | 22221898966507 |
24 | 126042573704637 |
25 | 729944250603862 |
26 | 4313430995825272 |
[1,2,6,18,57,188,651,2336,8719,33741,135185, 559908,2394326,10557283,47943126,223987316, 1075455181,5301593544,26807904317,138924912857, 737220195148,4002876571636,22221898966507, 126042573704637,729944250603862,4313430995825272] |