n | a(n) |
---|---|
1 | 1 |
2 | 255 |
3 | 6560 |
4 | 65280 |
5 | 390624 |
6 | 1672800 |
7 | 5764800 |
8 | 16711680 |
9 | 43040160 |
10 | 99609120 |
11 | 214358880 |
12 | 428236800 |
13 | 815730720 |
14 | 1470024000 |
15 | 2562493440 |
16 | 4278190080 |
17 | 6975757440 |
18 | 10975240800 |
19 | 16983563040 |
20 | 25499934720 |
21 | 37817088000 |
[1,255,6560,65280,390624,1672800,5764800,16711680, 43040160,99609120,214358880,428236800,815730720, 1470024000,2562493440,4278190080,6975757440, 10975240800,16983563040,25499934720,37817088000] |