n | a(n) |
---|---|
0 | 3 |
1 | 20 |
2 | 140 |
3 | 1000 |
4 | 7200 |
5 | 52000 |
6 | 376000 |
7 | 2720000 |
8 | 19680000 |
9 | 142400000 |
10 | 1030400000 |
11 | 7456000000 |
12 | 53952000000 |
13 | 390400000000 |
14 | 2824960000000 |
15 | 20441600000000 |
16 | 147916800000000 |
17 | 1070336000000000 |
18 | 7745024000000000 |
19 | 56043520000000000 |
[3,20,140,1000,7200,52000,376000,2720000,19680000, 142400000,1030400000,7456000000,53952000000, 390400000000,2824960000000,20441600000000, 147916800000000,1070336000000000,7745024000000000, 56043520000000000] |