n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 21 |
5 | 56 |
6 | 174 |
7 | 517 |
8 | 1664 |
9 | 5383 |
10 | 18199 |
11 | 62745 |
12 | 223390 |
13 | 813425 |
14 | 3040181 |
15 | 11620969 |
16 | 45446484 |
17 | 181537904 |
18 | 740369798 |
19 | 3079779662 |
20 | 13059203150 |
21 | 56406416004 |
22 | 248027678362 |
23 | 1109626606188 |
24 | 5048119061134 |
25 | 23342088591797 |
26 | 109648937760252 |
27 | 523036690273237 |
[1,1,3,7,21,56,174,517,1664,5383,18199,62745, 223390,813425,3040181,11620969,45446484,181537904, 740369798,3079779662,13059203150,56406416004, 248027678362,1109626606188,5048119061134, 23342088591797,109648937760252,523036690273237] |