n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 24 |
4 | 84 |
5 | 240 |
6 | 732 |
7 | 2184 |
8 | 6564 |
9 | 19680 |
10 | 59052 |
11 | 177144 |
12 | 531444 |
13 | 1594320 |
14 | 4782972 |
15 | 14348904 |
16 | 43046724 |
17 | 129140160 |
18 | 387420492 |
19 | 1162261464 |
20 | 3486784404 |
21 | 10460353200 |
22 | 31381059612 |
23 | 94143178824 |
24 | 282429536484 |
25 | 847288609440 |
26 | 2541865828332 |
27 | 7625597484984 |
28 | 22876792454964 |
[1,4,12,24,84,240,732,2184,6564,19680,59052, 177144,531444,1594320,4782972,14348904,43046724, 129140160,387420492,1162261464,3486784404, 10460353200,31381059612,94143178824,282429536484, 847288609440,2541865828332,7625597484984, 22876792454964] |