n | a(n) |
---|---|
4 | 1 |
5 | 5 |
6 | 23 |
7 | 115 |
8 | 668 |
9 | 3401 |
10 | 16469 |
11 | 74410 |
12 | 317612 |
13 | 1287147 |
14 | 5015932 |
15 | 18920467 |
16 | 69496943 |
17 | 249618639 |
18 | 879998839 |
19 | 3053446651 |
20 | 10452089459 |
21 | 35360685297 |
22 | 118416973230 |
23 | 393038044024 |
24 | 1294335897888 |
25 | 4232938101229 |
26 | 13757913332396 |
[1,5,23,115,668,3401,16469,74410,317612,1287147, 5015932,18920467,69496943,249618639,879998839, 3053446651,10452089459,35360685297,118416973230, 393038044024,1294335897888,4232938101229, 13757913332396] |