n | a(n) |
---|---|
8 | 1 |
9 | 0 |
10 | 1 |
11 | 1 |
12 | 5 |
13 | 5 |
14 | 21 |
15 | 40 |
16 | 176 |
17 | 500 |
18 | 2053 |
19 | 7532 |
20 | 31206 |
21 | 124552 |
22 | 521332 |
23 | 2167599 |
24 | 9183879 |
25 | 38965327 |
26 | 166956753 |
27 | 718004565 |
28 | 3107450143 |
29 | 13502835176 |
30 | 58956369552 |
31 | 258398671525 |
[1,0,1,1,5,5,21,40,176,500,2053,7532,31206,124552, 521332,2167599,9183879,38965327,166956753, 718004565,3107450143,13502835176,58956369552, 258398671525] |