n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 20 |
3 | 56 |
4 | 144 |
5 | 352 |
6 | 832 |
7 | 1920 |
8 | 4352 |
9 | 9728 |
10 | 21504 |
11 | 47104 |
12 | 102400 |
13 | 221184 |
14 | 475136 |
15 | 1015808 |
16 | 2162688 |
17 | 4587520 |
18 | 9699328 |
19 | 20447232 |
20 | 42991616 |
21 | 90177536 |
22 | 188743680 |
23 | 394264576 |
24 | 822083584 |
25 | 1711276032 |
26 | 3556769792 |
27 | 7381975040 |
28 | 15300820992 |
[1,6,20,56,144,352,832,1920,4352,9728,21504,47104, 102400,221184,475136,1015808,2162688,4587520, 9699328,20447232,42991616,90177536,188743680, 394264576,822083584,1711276032,3556769792, 7381975040,15300820992] |