n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 20 |
6 | 60 |
7 | 204 |
8 | 702 |
9 | 2526 |
10 | 9180 |
11 | 33989 |
12 | 126713 |
13 | 476597 |
14 | 1802109 |
15 | 6850969 |
16 | 26151529 |
17 | 100207548 |
18 | 385217382 |
19 | 1485216987 |
20 | 5741240989 |
21 | 22246000726 |
22 | 86383317470 |
23 | 336093551268 |
24 | 1309997856337 |
25 | 5114452295933 |
26 | 19998171631076 |
27 | 78306014924606 |
28 | 307022177714062 |
[1,1,3,7,20,60,204,702,2526,9180,33989,126713, 476597,1802109,6850969,26151529,100207548, 385217382,1485216987,5741240989,22246000726, 86383317470,336093551268,1309997856337, 5114452295933,19998171631076,78306014924606, 307022177714062] |