n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 50 |
5 | 164 |
6 | 556 |
7 | 1940 |
8 | 6933 |
9 | 24744 |
10 | 89546 |
11 | 327038 |
12 | 1207300 |
13 | 4459302 |
14 | 16591211 |
15 | 61991530 |
16 | 233069224 |
17 | 876816387 |
18 | 3313333609 |
19 | 12551052159 |
20 | 47736490574 |
21 | 181653337777 |
22 | 693339189471 |
23 | 2650530514317 |
24 | 10161297052095 |
25 | 38971134119472 |
26 | 149790839313023 |
27 | 576374272138597 |
28 | 2222447385907847 |
[1,2,5,15,50,164,556,1940,6933,24744,89546,327038, 1207300,4459302,16591211,61991530,233069224, 876816387,3313333609,12551052159,47736490574, 181653337777,693339189471,2650530514317, 10161297052095,38971134119472,149790839313023, 576374272138597,2222447385907847] |