n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 14 |
5 | 42 |
6 | 131 |
7 | 420 |
8 | 1375 |
9 | 4576 |
10 | 15431 |
11 | 52603 |
12 | 180957 |
13 | 627340 |
14 | 2189430 |
15 | 7685785 |
16 | 27118855 |
17 | 96123508 |
18 | 342099955 |
19 | 1221979374 |
20 | 4379357895 |
21 | 15742077045 |
22 | 56742085710 |
23 | 205041235750 |
24 | 742647580815 |
25 | 2695585363122 |
26 | 9803561513316 |
27 | 35720226039252 |
28 | 130373533268780 |
[1,1,2,5,14,42,131,420,1375,4576,15431,52603, 180957,627340,2189430,7685785,27118855,96123508, 342099955,1221979374,4379357895,15742077045, 56742085710,205041235750,742647580815, 2695585363122,9803561513316,35720226039252, 130373533268780] |