n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 8 |
4 | 28 |
5 | 80 |
6 | 252 |
7 | 776 |
8 | 2356 |
9 | 7200 |
10 | 21836 |
11 | 66104 |
12 | 199652 |
13 | 601424 |
14 | 1808252 |
15 | 5426024 |
16 | 16253460 |
17 | 48608384 |
18 | 145152940 |
19 | 432853144 |
20 | 1289129028 |
21 | 3834701744 |
22 | 11394112476 |
23 | 33820033480 |
24 | 100286009972 |
25 | 297101633248 |
26 | 879410116620 |
27 | 2600884035320 |
[0,4,8,28,80,252,776,2356,7200,21836,66104,199652, 601424,1808252,5426024,16253460,48608384, 145152940,432853144,1289129028,3834701744, 11394112476,33820033480,100286009972,297101633248, 879410116620,2600884035320] |