n | a(n) |
---|---|
4 | 1 |
5 | 2 |
6 | 7 |
7 | 22 |
8 | 68 |
9 | 214 |
10 | 691 |
11 | 2240 |
12 | 7396 |
13 | 24702 |
14 | 83469 |
15 | 284928 |
16 | 981814 |
17 | 3410990 |
18 | 11939752 |
19 | 42075308 |
20 | 149180356 |
21 | 531866972 |
22 | 1905872189 |
23 | 6861162880 |
24 | 24805796984 |
25 | 90035940942 |
26 | 327988261992 |
27 | 1198853954688 |
28 | 4395798528850 |
[1,2,7,22,68,214,691,2240,7396,24702,83469,284928, 981814,3410990,11939752,42075308,149180356, 531866972,1905872189,6861162880,24805796984, 90035940942,327988261992,1198853954688, 4395798528850] |