n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 51 |
5 | 183 |
6 | 690 |
7 | 2680 |
8 | 10664 |
9 | 43361 |
10 | 179166 |
11 | 750618 |
12 | 3182815 |
13 | 13627850 |
14 | 58858838 |
15 | 256136007 |
16 | 1121888880 |
17 | 4942820194 |
18 | 21890082385 |
19 | 97392793659 |
20 | 435140490144 |
21 | 1951512891396 |
22 | 8782251791612 |
23 | 39646601500866 |
24 | 179495259553219 |
25 | 814795429411189 |
26 | 3707690621124339 |
27 | 16909746064544733 |
[1,2,5,15,51,183,690,2680,10664,43361,179166, 750618,3182815,13627850,58858838,256136007, 1121888880,4942820194,21890082385,97392793659, 435140490144,1951512891396,8782251791612, 39646601500866,179495259553219,814795429411189, 3707690621124339,16909746064544733] |