n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 20 |
3 | 272 |
4 | 3440 |
5 | 40952 |
6 | 468560 |
7 | 5217032 |
8 | 56953280 |
9 | 612579512 |
10 | 6513215600 |
11 | 68618940392 |
12 | 717570463520 |
13 | 7458134171672 |
14 | 77123207545040 |
15 | 794108867905352 |
16 | 8146979811148160 |
17 | 83322818300333432 |
18 | 849905364703000880 |
[1,2,20,272,3440,40952,468560,5217032,56953280, 612579512,6513215600,68618940392,717570463520, 7458134171672,77123207545040,794108867905352, 8146979811148160,83322818300333432, 849905364703000880] |