n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 4 |
3 | 18 |
4 | 92 |
5 | 442 |
6 | 2004 |
7 | 8738 |
8 | 37132 |
9 | 155082 |
10 | 640004 |
11 | 2619058 |
12 | 10653372 |
13 | 43144922 |
14 | 174174004 |
15 | 701478978 |
16 | 2820264812 |
17 | 11324105962 |
18 | 45425564004 |
19 | 182089676498 |
20 | 729520967452 |
21 | 2921570654202 |
22 | 11696742970004 |
23 | 46818352939618 |
[0,2,4,18,92,442,2004,8738,37132,155082,640004, 2619058,10653372,43144922,174174004,701478978, 2820264812,11324105962,45425564004,182089676498, 729520967452,2921570654202,11696742970004, 46818352939618] |