n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 17 |
4 | 80 |
5 | 414 |
6 | 2289 |
7 | 13199 |
8 | 78306 |
9 | 474630 |
10 | 2926744 |
11 | 18304543 |
12 | 115837726 |
13 | 740379722 |
14 | 4772461321 |
15 | 30989448116 |
16 | 202518745795 |
17 | 1330961476358 |
18 | 8791022012712 |
19 | 58325109518331 |
20 | 388523983047285 |
21 | 2597516226459845 |
22 | 17423367396517210 |
23 | 117223205014488833 |
[1,1,4,17,80,414,2289,13199,78306,474630,2926744, 18304543,115837726,740379722,4772461321, 30989448116,202518745795,1330961476358, 8791022012712,58325109518331,388523983047285, 2597516226459845,17423367396517210, 117223205014488833] |