n | a(n) |
---|---|
1 | 400 |
2 | 3000 |
3 | 22500 |
4 | 105000 |
5 | 490000 |
6 | 1715000 |
7 | 6002500 |
8 | 17287200 |
9 | 49787136 |
10 | 124467840 |
11 | 311169600 |
12 | 698544000 |
13 | 1568160000 |
14 | 3234330000 |
15 | 6670805625 |
16 | 12847477500 |
17 | 24743290000 |
18 | 45032787800 |
19 | 81959673796 |
20 | 142244061960 |
[400,3000,22500,105000,490000,1715000,6002500, 17287200,49787136,124467840,311169600,698544000, 1568160000,3234330000,6670805625,12847477500, 24743290000,45032787800,81959673796,142244061960] |