n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 17 |
5 | 50 |
6 | 148 |
7 | 441 |
8 | 1318 |
9 | 3946 |
10 | 11825 |
11 | 35454 |
12 | 106328 |
13 | 318929 |
14 | 956698 |
15 | 2869950 |
16 | 8609617 |
17 | 25828474 |
18 | 77484812 |
19 | 232453449 |
20 | 697358750 |
21 | 2092073666 |
22 | 6276216817 |
23 | 18828643686 |
24 | 56485920112 |
25 | 169457742625 |
26 | 508373199218 |
27 | 1525119551286 |
[0,1,2,6,17,50,148,441,1318,3946,11825,35454, 106328,318929,956698,2869950,8609617,25828474, 77484812,232453449,697358750,2092073666, 6276216817,18828643686,56485920112,169457742625, 508373199218,1525119551286] |