n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 150 |
5 | 1198 |
6 | 10900 |
7 | 111392 |
8 | 1268816 |
9 | 16029676 |
10 | 223672208 |
11 | 3431679208 |
12 | 57595357568 |
13 | 1051552630592 |
14 | 20766322925296 |
15 | 441147381668704 |
16 | 10029896993061488 |
17 | 242949296094059648 |
18 | 6244343162806585552 |
19 | 169693360047016652048 |
20 | 4860575220802324411120 |
21 | 146335002352369970686352 |
[1,1,4,22,150,1198,10900,111392,1268816,16029676, 223672208,3431679208,57595357568,1051552630592, 20766322925296,441147381668704,10029896993061488, 242949296094059648,6244343162806585552, 169693360047016652048,4860575220802324411120, 146335002352369970686352] |