n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 5 |
4 | 16 |
5 | 54 |
6 | 180 |
7 | 595 |
8 | 1964 |
9 | 6485 |
10 | 21418 |
11 | 70740 |
12 | 233640 |
13 | 771661 |
14 | 2548622 |
15 | 8417525 |
16 | 27801196 |
17 | 91821114 |
18 | 303264540 |
19 | 1001614735 |
20 | 3308108744 |
21 | 10925940965 |
22 | 36085931638 |
23 | 119183735880 |
24 | 393637139280 |
25 | 1300095153721 |
26 | 4293922600442 |
[1,2,5,16,54,180,595,1964,6485,21418,70740,233640, 771661,2548622,8417525,27801196,91821114, 303264540,1001614735,3308108744,10925940965, 36085931638,119183735880,393637139280, 1300095153721,4293922600442] |