n | a(n) |
---|---|
3 | 1 |
4 | 2 |
5 | 7 |
6 | 22 |
7 | 68 |
8 | 218 |
9 | 721 |
10 | 2438 |
11 | 8491 |
12 | 30478 |
13 | 112524 |
14 | 428382 |
15 | 1678600 |
16 | 6778708 |
17 | 28169286 |
18 | 120516092 |
19 | 530081370 |
20 | 2396797920 |
21 | 11125584584 |
22 | 52993063796 |
23 | 258676491628 |
24 | 1293160049244 |
25 | 6612750833996 |
26 | 34564483264256 |
27 | 184470133103464 |
28 | 1004514566402816 |
[1,2,7,22,68,218,721,2438,8491,30478,112524, 428382,1678600,6778708,28169286,120516092, 530081370,2396797920,11125584584,52993063796, 258676491628,1293160049244,6612750833996, 34564483264256,184470133103464,1004514566402816] |