n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 19 |
3 | 112 |
4 | 751 |
5 | 5404 |
6 | 40573 |
7 | 313408 |
8 | 2471167 |
9 | 19791004 |
10 | 160459069 |
11 | 1313922064 |
12 | 10847561089 |
13 | 90174127684 |
14 | 754009158019 |
15 | 6336733626112 |
16 | 53489159252671 |
17 | 453258909448636 |
18 | 3854034482891725 |
19 | 32871004555812112 |
20 | 281127047928811201 |
[1,4,19,112,751,5404,40573,313408,2471167, 19791004,160459069,1313922064,10847561089, 90174127684,754009158019,6336733626112, 53489159252671,453258909448636,3854034482891725, 32871004555812112,281127047928811201] |