n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 2 |
3 | 6 |
4 | 12 |
5 | 28 |
6 | 62 |
7 | 140 |
8 | 314 |
9 | 706 |
10 | 1586 |
11 | 3564 |
12 | 8008 |
13 | 17994 |
14 | 40432 |
15 | 90850 |
16 | 204138 |
17 | 458694 |
18 | 1030676 |
19 | 2315908 |
20 | 5203798 |
21 | 11692828 |
22 | 26273546 |
23 | 59036122 |
24 | 132652962 |
25 | 298068500 |
26 | 669753840 |
27 | 1504923218 |
28 | 3381531776 |
29 | 7598232930 |
30 | 17073074418 |
[0,2,2,6,12,28,62,140,314,706,1586,3564,8008, 17994,40432,90850,204138,458694,1030676,2315908, 5203798,11692828,26273546,59036122,132652962, 298068500,669753840,1504923218,3381531776, 7598232930,17073074418] |