n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 138 |
3 | 2960 |
4 | 70090 |
5 | 1756608 |
6 | 45678864 |
7 | 1219013664 |
8 | 33162009210 |
9 | 915589703600 |
10 | 25578044554348 |
11 | 721420319128704 |
12 | 20509529725235824 |
13 | 586986330979489280 |
14 | 16895932626393943680 |
15 | 488743896405192037440 |
16 | 14198840150264907505050 |
17 | 414069243091986225102480 |
18 | 12115901803035178006468500 |
[1,8,138,2960,70090,1756608,45678864,1219013664, 33162009210,915589703600,25578044554348, 721420319128704,20509529725235824, 586986330979489280,16895932626393943680, 488743896405192037440,14198840150264907505050, 414069243091986225102480, 12115901803035178006468500] |