n | a(n) |
---|---|
3 | 0 |
4 | 1 |
5 | 4 |
6 | 4 |
7 | 6 |
8 | 20 |
9 | 40 |
10 | 94 |
11 | 238 |
12 | 541 |
13 | 1294 |
14 | 3360 |
15 | 8173 |
16 | 19987 |
17 | 51528 |
18 | 131436 |
19 | 334749 |
20 | 866390 |
21 | 2252976 |
22 | 5878486 |
23 | 15411939 |
24 | 40580608 |
25 | 107264611 |
26 | 284120728 |
27 | 754178471 |
28 | 2007015523 |
29 | 5349093515 |
30 | 14276197975 |
31 | 38168672182 |
[0,1,4,4,6,20,40,94,238,541,1294,3360,8173,19987, 51528,131436,334749,866390,2252976,5878486, 15411939,40580608,107264611,284120728,754178471, 2007015523,5349093515,14276197975,38168672182] |