n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 2 |
4 | 8 |
5 | 22 |
6 | 70 |
7 | 202 |
8 | 622 |
9 | 1844 |
10 | 5576 |
11 | 16658 |
12 | 50114 |
13 | 150140 |
14 | 450824 |
15 | 1351850 |
16 | 4056794 |
17 | 12168538 |
18 | 36509302 |
19 | 109522330 |
20 | 328578142 |
21 | 985717768 |
22 | 2957186620 |
23 | 8871509746 |
24 | 26614629466 |
25 | 79843738258 |
26 | 239531515054 |
27 | 718594094338 |
[0,1,2,8,22,70,202,622,1844,5576,16658,50114, 150140,450824,1351850,4056794,12168538,36509302, 109522330,328578142,985717768,2957186620, 8871509746,26614629466,79843738258,239531515054, 718594094338] |