n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 2 |
4 | 8 |
5 | 14 |
6 | 40 |
7 | 86 |
8 | 222 |
9 | 518 |
10 | 1296 |
11 | 3130 |
12 | 7770 |
13 | 19066 |
14 | 47324 |
15 | 117094 |
16 | 291260 |
17 | 724302 |
18 | 1806220 |
19 | 4507230 |
20 | 11266718 |
21 | 28188070 |
22 | 70609316 |
23 | 177023466 |
24 | 444231564 |
25 | 1115639586 |
26 | 2803975860 |
27 | 7052132546 |
28 | 17748069294 |
29 | 44693162266 |
[1,0,2,2,8,14,40,86,222,518,1296,3130,7770,19066, 47324,117094,291260,724302,1806220,4507230, 11266718,28188070,70609316,177023466,444231564, 1115639586,2803975860,7052132546,17748069294, 44693162266] |