n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 6 |
4 | 12 |
5 | 30 |
6 | 54 |
7 | 126 |
8 | 240 |
9 | 504 |
10 | 990 |
11 | 2046 |
12 | 4020 |
13 | 8190 |
14 | 16254 |
15 | 32730 |
16 | 65280 |
17 | 131070 |
18 | 261576 |
19 | 524286 |
20 | 1047540 |
21 | 2097018 |
22 | 4192254 |
23 | 8388606 |
24 | 16772880 |
25 | 33554400 |
26 | 67100670 |
27 | 134217216 |
28 | 268419060 |
29 | 536870910 |
30 | 1073708010 |
31 | 2147483646 |
[0,2,6,12,30,54,126,240,504,990,2046,4020,8190, 16254,32730,65280,131070,261576,524286,1047540, 2097018,4192254,8388606,16772880,33554400, 67100670,134217216,268419060,536870910,1073708010, 2147483646] |