n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 4 |
4 | 9 |
5 | 34 |
6 | 71 |
7 | 245 |
8 | 543 |
9 | 1835 |
10 | 4223 |
11 | 14167 |
12 | 33279 |
13 | 111279 |
14 | 264191 |
15 | 882015 |
16 | 2105343 |
17 | 7023295 |
18 | 16809983 |
19 | 56055167 |
20 | 134348799 |
21 | 447916799 |
22 | 1074266111 |
23 | 3581236735 |
24 | 8592031743 |
25 | 28641504255 |
26 | 68727865343 |
27 | 229098477567 |
[0,0,4,9,34,71,245,543,1835,4223,14167,33279, 111279,264191,882015,2105343,7023295,16809983, 56055167,134348799,447916799,1074266111, 3581236735,8592031743,28641504255,68727865343, 229098477567] |