n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 74 |
7 | 314 |
8 | 1614 |
9 | 8650 |
10 | 52794 |
11 | 337410 |
12 | 2373822 |
13 | 17327770 |
14 | 136539154 |
15 | 1115206818 |
16 | 9671306438 |
17 | 86529147794 |
18 | 816066328602 |
19 | 7904640819682 |
20 | 80089651530566 |
21 | 832008919174434 |
22 | 8983256694817802 |
23 | 99219778649809162 |
24 | 1134999470682805134 |
25 | 13241030890523397154 |
[1,1,2,6,18,74,314,1614,8650,52794,337410,2373822, 17327770,136539154,1115206818,9671306438, 86529147794,816066328602,7904640819682, 80089651530566,832008919174434,8983256694817802, 99219778649809162,1134999470682805134, 13241030890523397154] |