n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 12 |
6 | 30 |
7 | 69 |
8 | 150 |
9 | 317 |
10 | 659 |
11 | 1361 |
12 | 2784 |
13 | 5686 |
14 | 11557 |
15 | 23445 |
16 | 47472 |
17 | 95991 |
18 | 193891 |
19 | 391266 |
20 | 788979 |
21 | 1589856 |
22 | 3201863 |
23 | 6445059 |
24 | 12967425 |
25 | 26080302 |
26 | 52434693 |
27 | 105386552 |
28 | 211751544 |
29 | 425359720 |
30 | 854245385 |
31 | 1715204991 |
[0,0,1,4,12,30,69,150,317,659,1361,2784,5686, 11557,23445,47472,95991,193891,391266,788979, 1589856,3201863,6445059,12967425,26080302, 52434693,105386552,211751544,425359720,854245385, 1715204991] |