n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 34 |
4 | 208 |
5 | 1272 |
6 | 7818 |
7 | 47998 |
8 | 294832 |
9 | 1810916 |
10 | 11123242 |
11 | 68322370 |
12 | 419657160 |
13 | 2577663664 |
14 | 15832804586 |
15 | 97249963694 |
16 | 597339237368 |
17 | 3669041620356 |
18 | 22536383966338 |
19 | 138425413185266 |
20 | 850251533001856 |
21 | 5222506855786032 |
[0,6,34,208,1272,7818,47998,294832,1810916, 11123242,68322370,419657160,2577663664, 15832804586,97249963694,597339237368, 3669041620356,22536383966338,138425413185266, 850251533001856,5222506855786032] |