n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 8 |
4 | 24 |
5 | 68 |
6 | 188 |
7 | 516 |
8 | 1412 |
9 | 3860 |
10 | 10548 |
11 | 28820 |
12 | 78740 |
13 | 215124 |
14 | 587732 |
15 | 1605716 |
16 | 4386900 |
17 | 11985236 |
18 | 32744276 |
19 | 89459028 |
20 | 244406612 |
21 | 667731284 |
22 | 1824275796 |
23 | 4984014164 |
24 | 13616579924 |
25 | 37201188180 |
26 | 101635536212 |
27 | 277673448788 |
28 | 758617970004 |
29 | 2072582837588 |
[0,0,2,8,24,68,188,516,1412,3860,10548,28820, 78740,215124,587732,1605716,4386900,11985236, 32744276,89459028,244406612,667731284,1824275796, 4984014164,13616579924,37201188180,101635536212, 277673448788,758617970004,2072582837588] |