n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 48 |
5 | 159 |
6 | 539 |
7 | 1859 |
8 | 6500 |
9 | 22984 |
10 | 82042 |
11 | 295222 |
12 | 1069776 |
13 | 3900225 |
14 | 14296455 |
15 | 52656315 |
16 | 194777340 |
17 | 723281460 |
18 | 2695246950 |
19 | 10075695330 |
20 | 37776123840 |
21 | 142010723790 |
22 | 535172997294 |
23 | 2021412800430 |
24 | 7651226309768 |
[1,2,5,15,48,159,539,1859,6500,22984,82042,295222, 1069776,3900225,14296455,52656315,194777340, 723281460,2695246950,10075695330,37776123840, 142010723790,535172997294,2021412800430, 7651226309768] |