n | a(n) |
---|---|
0 | -1 |
1 | 6 |
2 | 10 |
3 | 28 |
4 | 90 |
5 | 308 |
6 | 1092 |
7 | 3960 |
8 | 14586 |
9 | 54340 |
10 | 204204 |
11 | 772616 |
12 | 2939300 |
13 | 11232648 |
14 | 43088200 |
15 | 165815280 |
16 | 639859770 |
17 | 2475036900 |
18 | 9593714460 |
19 | 37255818600 |
20 | 144915581580 |
21 | 564514356120 |
22 | 2201964031800 |
23 | 8599360982160 |
24 | 33619842137700 |
25 | 131570223027048 |
26 | 515366318553912 |
[-1,6,10,28,90,308,1092,3960,14586,54340,204204, 772616,2939300,11232648,43088200,165815280, 639859770,2475036900,9593714460,37255818600, 144915581580,564514356120,2201964031800, 8599360982160,33619842137700,131570223027048, 515366318553912] |