n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 23 |
5 | 66 |
6 | 210 |
7 | 733 |
8 | 2781 |
9 | 11378 |
10 | 49864 |
11 | 232769 |
12 | 1151915 |
13 | 6018786 |
14 | 33087206 |
15 | 190780213 |
16 | 1150653921 |
17 | 7241710930 |
18 | 47454745804 |
19 | 323154696185 |
20 | 2282779990495 |
21 | 16700904488706 |
22 | 126356632390298 |
23 | 987303454928973 |
24 | 7957133905608837 |
25 | 66071772829247410 |
[1,2,4,9,23,66,210,733,2781,11378,49864,232769, 1151915,6018786,33087206,190780213,1150653921, 7241710930,47454745804,323154696185,2282779990495, 16700904488706,126356632390298,987303454928973, 7957133905608837,66071772829247410] |