n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 30 |
5 | 97 |
6 | 336 |
7 | 1153 |
8 | 4081 |
9 | 14552 |
10 | 52609 |
11 | 191657 |
12 | 704385 |
13 | 2604476 |
14 | 9687433 |
15 | 36207241 |
16 | 135920489 |
17 | 512182805 |
18 | 1936656361 |
19 | 7345211322 |
20 | 27935373368 |
21 | 106509551719 |
22 | 407015199144 |
23 | 1558603221623 |
24 | 5979839952471 |
25 | 22983021033071 |
26 | 88477003979994 |
27 | 341120527468590 |
[1,1,3,9,30,97,336,1153,4081,14552,52609,191657, 704385,2604476,9687433,36207241,135920489, 512182805,1936656361,7345211322,27935373368, 106509551719,407015199144,1558603221623, 5979839952471,22983021033071,88477003979994, 341120527468590] |