n | a(n) |
---|---|
0 | 0 |
1 | 5 |
2 | 20 |
3 | 80 |
4 | 380 |
5 | 1820 |
6 | 9020 |
7 | 44720 |
8 | 223220 |
9 | 1114280 |
10 | 5569580 |
11 | 27838880 |
12 | 139185380 |
13 | 695882180 |
14 | 3479366180 |
15 | 17396607680 |
16 | 86982815180 |
17 | 434912961620 |
18 | 2174563693820 |
19 | 10872812899520 |
20 | 54364058928020 |
21 | 271820266801220 |
22 | 1359101306167220 |
23 | 6795506391650720 |
[0,5,20,80,380,1820,9020,44720,223220,1114280, 5569580,27838880,139185380,695882180,3479366180, 17396607680,86982815180,434912961620, 2174563693820,10872812899520,54364058928020, 271820266801220,1359101306167220,6795506391650720] |