n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 20 |
3 | 148 |
4 | 1104 |
5 | 8240 |
6 | 61504 |
7 | 459072 |
8 | 3426560 |
9 | 25576192 |
10 | 190903296 |
11 | 1424921600 |
12 | 10635759616 |
13 | 79386390528 |
14 | 592548085760 |
15 | 4422839123968 |
16 | 33012520648704 |
17 | 246408808693760 |
18 | 1839220386955264 |
19 | 13728127860867072 |
[1,3,20,148,1104,8240,61504,459072,3426560, 25576192,190903296,1424921600,10635759616, 79386390528,592548085760,4422839123968, 33012520648704,246408808693760,1839220386955264, 13728127860867072] |