n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 24 |
3 | 160 |
4 | 1088 |
5 | 7424 |
6 | 50688 |
7 | 346112 |
8 | 2363392 |
9 | 16138240 |
10 | 110198784 |
11 | 752484352 |
12 | 5138284544 |
13 | 35086401536 |
14 | 239584935936 |
15 | 1635988275200 |
16 | 11171226714112 |
17 | 76281907511296 |
18 | 520885446377472 |
19 | 3556828310929408 |
20 | 24287542916415488 |
[1,4,24,160,1088,7424,50688,346112,2363392, 16138240,110198784,752484352,5138284544, 35086401536,239584935936,1635988275200, 11171226714112,76281907511296,520885446377472, 3556828310929408,24287542916415488] |