n | a(n) |
---|---|
6 | 1 |
7 | 0 |
8 | 1 |
9 | 3 |
10 | 5 |
11 | 9 |
12 | 26 |
13 | 65 |
14 | 193 |
15 | 632 |
16 | 2173 |
17 | 8049 |
18 | 31690 |
19 | 130773 |
20 | 563849 |
21 | 2525348 |
22 | 11702264 |
23 | 55948154 |
24 | 275331956 |
25 | 1392136462 |
26 | 7221272289 |
27 | 38380011748 |
28 | 208778309856 |
[1,0,1,3,5,9,26,65,193,632,2173,8049,31690,130773, 563849,2525348,11702264,55948154,275331956, 1392136462,7221272289,38380011748,208778309856] |