n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 68 |
4 | 576 |
5 | 4880 |
6 | 41344 |
7 | 350272 |
8 | 2967552 |
9 | 25141504 |
10 | 213002240 |
11 | 1804583936 |
12 | 15288680448 |
13 | 129527779328 |
14 | 1097376956416 |
15 | 9297126768640 |
16 | 78766521974784 |
17 | 667320682872832 |
18 | 5653631550881792 |
19 | 47898335138545664 |
20 | 405801207311892480 |
21 | 3438002999049322496 |
[0,1,8,68,576,4880,41344,350272,2967552,25141504, 213002240,1804583936,15288680448,129527779328, 1097376956416,9297126768640,78766521974784, 667320682872832,5653631550881792, 47898335138545664,405801207311892480, 3438002999049322496] |