n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 40 |
3 | 544 |
4 | 8512 |
5 | 144448 |
6 | 2584960 |
7 | 48026368 |
8 | 917535232 |
9 | 17911696384 |
10 | 355725727744 |
11 | 7164414312448 |
12 | 145983839272960 |
13 | 3003998986682368 |
14 | 62337412584669184 |
15 | 1303045468017786880 |
16 | 27411525832634269696 |
17 | 579884892273731436544 |
18 | 12328565505725394583552 |
[1,4,40,544,8512,144448,2584960,48026368, 917535232,17911696384,355725727744,7164414312448, 145983839272960,3003998986682368, 62337412584669184,1303045468017786880, 27411525832634269696,579884892273731436544, 12328565505725394583552] |