n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 8 |
5 | 30 |
6 | 102 |
7 | 308 |
8 | 905 |
9 | 2744 |
10 | 8473 |
11 | 26112 |
12 | 79924 |
13 | 244204 |
14 | 747160 |
15 | 2288521 |
16 | 7009458 |
17 | 21461803 |
18 | 65704200 |
19 | 201162258 |
20 | 615922714 |
21 | 1885853660 |
22 | 5774072225 |
23 | 17678809840 |
24 | 54128358209 |
25 | 165728860112 |
26 | 507424764216 |
27 | 1553620027784 |
28 | 4756831354752 |
[0,1,2,3,8,30,102,308,905,2744,8473,26112,79924, 244204,747160,2288521,7009458,21461803,65704200, 201162258,615922714,1885853660,5774072225, 17678809840,54128358209,165728860112,507424764216, 1553620027784,4756831354752] |