n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 26 |
4 | 90 |
5 | 306 |
6 | 1046 |
7 | 3570 |
8 | 12190 |
9 | 41618 |
10 | 142094 |
11 | 485138 |
12 | 1656366 |
13 | 5655186 |
14 | 19308014 |
15 | 65921682 |
16 | 225070702 |
17 | 768439442 |
18 | 2623616366 |
19 | 8957586578 |
20 | 30583113582 |
21 | 104417281170 |
22 | 356502897518 |
23 | 1217177027730 |
24 | 4155702315886 |
[1,2,8,26,90,306,1046,3570,12190,41618,142094, 485138,1656366,5655186,19308014,65921682, 225070702,768439442,2623616366,8957586578, 30583113582,104417281170,356502897518, 1217177027730,4155702315886] |