n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 61 |
6 | 209 |
7 | 751 |
8 | 2780 |
9 | 10530 |
10 | 40645 |
11 | 159331 |
12 | 634004 |
13 | 2555818 |
14 | 10406137 |
15 | 42736003 |
16 | 176987498 |
17 | 738572161 |
18 | 3101989207 |
19 | 13102951031 |
20 | 55643811842 |
21 | 237474178387 |
22 | 1018032832418 |
23 | 4381947392234 |
24 | 18932122549024 |
25 | 82083627726775 |
26 | 357053109955461 |
27 | 1557819782212992 |
28 | 6815800335178806 |
[1,1,2,6,19,61,209,751,2780,10530,40645,159331, 634004,2555818,10406137,42736003,176987498, 738572161,3101989207,13102951031,55643811842, 237474178387,1018032832418,4381947392234, 18932122549024,82083627726775,357053109955461, 1557819782212992,6815800335178806] |