n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 30 |
4 | 60 |
5 | 210 |
6 | 330 |
7 | 660 |
8 | 2730 |
9 | 3570 |
10 | 6270 |
11 | 12540 |
12 | 53130 |
13 | 79170 |
14 | 110670 |
15 | 221340 |
16 | 514140 |
17 | 1799490 |
18 | 2284590 |
19 | 4196010 |
20 | 6750870 |
21 | 13501740 |
22 | 37532220 |
23 | 97350330 |
24 | 131362770 |
25 | 189620970 |
26 | 379241940 |
27 | 735844830 |
28 | 1471689660 |
[1,4,12,30,60,210,330,660,2730,3570,6270,12540, 53130,79170,110670,221340,514140,1799490,2284590, 4196010,6750870,13501740,37532220,97350330, 131362770,189620970,379241940,735844830, 1471689660] |