n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 18 |
4 | 216 |
5 | 2160 |
6 | 19440 |
7 | 163296 |
8 | 1306368 |
9 | 10077696 |
10 | 75582720 |
11 | 554273280 |
12 | 3990767616 |
13 | 28298170368 |
14 | 198087192576 |
15 | 1371372871680 |
16 | 9403699691520 |
17 | 63945157902336 |
18 | 431629815840768 |
19 | 2894458765049856 |
20 | 19296391766999040 |
[0,0,1,18,216,2160,19440,163296,1306368,10077696, 75582720,554273280,3990767616,28298170368, 198087192576,1371372871680,9403699691520, 63945157902336,431629815840768,2894458765049856, 19296391766999040] |