n | a(n) |
---|---|
3 | 0 |
4 | 0 |
5 | 4 |
6 | 6 |
7 | 4 |
8 | 30 |
9 | 65 |
10 | 104 |
11 | 277 |
12 | 756 |
13 | 1542 |
14 | 3615 |
15 | 9759 |
16 | 23306 |
17 | 55566 |
18 | 145499 |
19 | 370660 |
20 | 933344 |
21 | 2428144 |
22 | 6345229 |
23 | 16500325 |
24 | 43314782 |
25 | 114383765 |
26 | 302057417 |
27 | 799656246 |
28 | 2124592221 |
29 | 5652658289 |
30 | 15058739676 |
31 | 40201128401 |
[0,0,4,6,4,30,65,104,277,756,1542,3615,9759,23306, 55566,145499,370660,933344,2428144,6345229, 16500325,43314782,114383765,302057417,799656246, 2124592221,5652658289,15058739676,40201128401] |