n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 6 |
5 | 13 |
6 | 30 |
7 | 74 |
8 | 196 |
9 | 555 |
10 | 1666 |
11 | 5269 |
12 | 17476 |
13 | 60539 |
14 | 218277 |
15 | 816718 |
16 | 3163136 |
17 | 12652545 |
18 | 52167780 |
19 | 221329146 |
20 | 964751381 |
21 | 4314499339 |
22 | 19771519807 |
23 | 92736648099 |
24 | 444749340320 |
25 | 2178817894447 |
26 | 10894089472236 |
27 | 55549174801758 |
[1,2,3,6,13,30,74,196,555,1666,5269,17476,60539, 218277,816718,3163136,12652545,52167780,221329146, 964751381,4314499339,19771519807,92736648099, 444749340320,2178817894447,10894089472236, 55549174801758] |