n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 272 |
4 | 2150 |
5 | 16992 |
6 | 134848 |
7 | 1072192 |
8 | 8536914 |
9 | 68036600 |
10 | 542607560 |
11 | 4329671040 |
12 | 34561892560 |
13 | 275979195520 |
14 | 2204266118400 |
15 | 17609217372416 |
16 | 140698273234634 |
17 | 1124340854572296 |
18 | 8985828520591912 |
19 | 71822662173752800 |
[1,4,36,272,2150,16992,134848,1072192,8536914, 68036600,542607560,4329671040,34561892560, 275979195520,2204266118400,17609217372416, 140698273234634,1124340854572296,8985828520591912, 71822662173752800] |