n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 31 |
4 | 377 |
5 | 6415 |
6 | 142252 |
7 | 3919208 |
8 | 129681162 |
9 | 5025119715 |
10 | 223662035160 |
11 | 11260717242863 |
12 | 633424125262667 |
13 | 39405127536106444 |
14 | 2688050940578533440 |
15 | 199621706483099855304 |
16 | 16038639938585081005722 |
17 | 1386688821351774846453155 |
18 | 128409360760837836935472512 |
[1,1,4,31,377,6415,142252,3919208,129681162, 5025119715,223662035160,11260717242863, 633424125262667,39405127536106444, 2688050940578533440,199621706483099855304, 16038639938585081005722,1386688821351774846453155, 128409360760837836935472512] |