n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 4 |
3 | 4 |
4 | 24 |
5 | 56 |
6 | 188 |
7 | 540 |
8 | 1648 |
9 | 4912 |
10 | 14772 |
11 | 44276 |
12 | 132872 |
13 | 398568 |
14 | 1195756 |
15 | 3587212 |
16 | 10761696 |
17 | 32285024 |
18 | 96855140 |
19 | 290565348 |
20 | 871696120 |
21 | 2615088280 |
22 | 7845264924 |
23 | 23535794684 |
24 | 70607384144 |
25 | 211822152336 |
26 | 635466457108 |
27 | 1906399371220 |
28 | 5719198113768 |
29 | 17157594341192 |
[1,0,4,4,24,56,188,540,1648,4912,14772,44276, 132872,398568,1195756,3587212,10761696,32285024, 96855140,290565348,871696120,2615088280, 7845264924,23535794684,70607384144,211822152336, 635466457108,1906399371220,5719198113768, 17157594341192] |