n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 28 |
6 | 145 |
7 | 703 |
8 | 3288 |
9 | 14980 |
10 | 66958 |
11 | 294864 |
12 | 1283142 |
13 | 5529698 |
14 | 23637592 |
15 | 100350059 |
16 | 423511851 |
17 | 1778210188 |
18 | 7432635711 |
19 | 30943479193 |
20 | 128365649488 |
21 | 530810149910 |
22 | 2188638842860 |
23 | 9000532494016 |
24 | 36925016172060 |
25 | 151153394192532 |
[0,0,1,5,28,145,703,3288,14980,66958,294864, 1283142,5529698,23637592,100350059,423511851, 1778210188,7432635711,30943479193,128365649488, 530810149910,2188638842860,9000532494016, 36925016172060,151153394192532] |