n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 21 |
6 | 60 |
7 | 190 |
8 | 600 |
9 | 1977 |
10 | 6589 |
11 | 22408 |
12 | 77050 |
13 | 268178 |
14 | 941599 |
15 | 3333585 |
16 | 11882427 |
17 | 42615480 |
18 | 153653039 |
19 | 556664752 |
20 | 2025330509 |
21 | 7397242875 |
22 | 27111563026 |
23 | 99681629658 |
24 | 367563272278 |
25 | 1358945378906 |
26 | 5036549490009 |
27 | 18708739990129 |
28 | 69640873691941 |
[1,1,3,7,21,60,190,600,1977,6589,22408,77050, 268178,941599,3333585,11882427,42615480,153653039, 556664752,2025330509,7397242875,27111563026, 99681629658,367563272278,1358945378906, 5036549490009,18708739990129,69640873691941] |