n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 0 |
4 | 11 |
5 | 26 |
6 | 46 |
7 | 204 |
8 | 696 |
9 | 1493 |
10 | 5880 |
11 | 18994 |
12 | 49941 |
13 | 174020 |
14 | 552946 |
15 | 1590917 |
16 | 5237693 |
17 | 16486804 |
18 | 49511202 |
19 | 158599036 |
20 | 497008665 |
21 | 1523240497 |
22 | 4815373712 |
23 | 15059431049 |
24 | 46604564297 |
25 | 146391271270 |
26 | 457401829113 |
27 | 1422103399094 |
[0,4,0,11,26,46,204,696,1493,5880,18994,49941, 174020,552946,1590917,5237693,16486804,49511202, 158599036,497008665,1523240497,4815373712, 15059431049,46604564297,146391271270,457401829113, 1422103399094] |