n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 8 |
7 | 41 |
8 | 171 |
9 | 633 |
10 | 2171 |
11 | 7070 |
12 | 22195 |
13 | 67830 |
14 | 203130 |
15 | 598806 |
16 | 1743258 |
17 | 5023711 |
18 | 14356226 |
19 | 40737383 |
20 | 114904941 |
21 | 322432215 |
22 | 900707165 |
23 | 2506181060 |
24 | 6948996085 |
25 | 19207795836 |
26 | 52944197508 |
27 | 145567226556 |
28 | 399314965956 |
29 | 1093107693133 |
30 | 2986640695436 |
[0,0,0,0,1,8,41,171,633,2171,7070,22195,67830, 203130,598806,1743258,5023711,14356226,40737383, 114904941,322432215,900707165,2506181060, 6948996085,19207795836,52944197508,145567226556, 399314965956,1093107693133,2986640695436] |