n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 15 |
4 | 71 |
5 | 269 |
6 | 1274 |
7 | 4827 |
8 | 22861 |
9 | 86617 |
10 | 410224 |
11 | 1554279 |
12 | 7361171 |
13 | 27890405 |
14 | 132090854 |
15 | 500473011 |
16 | 2370274201 |
17 | 8980623793 |
18 | 42532844764 |
19 | 161150755263 |
20 | 763220931551 |
21 | 2891732970941 |
22 | 13695443923154 |
23 | 51890042721675 |
[1,4,15,71,269,1274,4827,22861,86617,410224, 1554279,7361171,27890405,132090854,500473011, 2370274201,8980623793,42532844764,161150755263, 763220931551,2891732970941,13695443923154, 51890042721675] |