n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 24 |
3 | 168 |
4 | 1280 |
5 | 10296 |
6 | 86016 |
7 | 739024 |
8 | 6488064 |
9 | 57946200 |
10 | 524812288 |
11 | 4808643120 |
12 | 44493176832 |
13 | 415146189360 |
14 | 3901709352960 |
15 | 36902658748320 |
16 | 350980432461824 |
17 | 3354743017001880 |
18 | 32207616155320320 |
19 | 310446853795570800 |
20 | 3003167577200394240 |
21 | 29146910264615460240 |
[1,4,24,168,1280,10296,86016,739024,6488064, 57946200,524812288,4808643120,44493176832, 415146189360,3901709352960,36902658748320, 350980432461824,3354743017001880, 32207616155320320,310446853795570800, 3003167577200394240,29146910264615460240] |