n | a(n) |
---|---|
0 | 3 |
1 | 15 |
2 | 105 |
3 | 315 |
4 | 6930 |
5 | 18018 |
6 | 90090 |
7 | 218790 |
8 | 2078505 |
9 | 4849845 |
10 | 22309287 |
11 | 50702925 |
12 | 1825305300 |
13 | 4071834900 |
14 | 18032411700 |
15 | 39671305740 |
16 | 347123925225 |
17 | 755505013725 |
18 | 3273855059475 |
19 | 7064634602025 |
20 | 121511715154830 |
[3,15,105,315,6930,18018,90090,218790,2078505, 4849845,22309287,50702925,1825305300,4071834900, 18032411700,39671305740,347123925225,755505013725, 3273855059475,7064634602025,121511715154830] |