n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 20 |
3 | 96 |
4 | 528 |
5 | 2880 |
6 | 16704 |
7 | 96768 |
8 | 573696 |
9 | 3400704 |
10 | 20321280 |
11 | 121430016 |
12 | 727584768 |
13 | 4359536640 |
14 | 26145275904 |
15 | 156799991808 |
16 | 940656623616 |
17 | 5643079778304 |
18 | 33856758743040 |
19 | 203130232897536 |
20 | 1218760758263808 |
21 | 7312440714854400 |
22 | 43874396619669504 |
23 | 263244893701275648 |
24 | 1579466390174171136 |
[1,4,20,96,528,2880,16704,96768,573696,3400704, 20321280,121430016,727584768,4359536640, 26145275904,156799991808,940656623616, 5643079778304,33856758743040,203130232897536, 1218760758263808,7312440714854400, 43874396619669504,263244893701275648, 1579466390174171136] |