n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 12 |
6 | 36 |
7 | 104 |
8 | 292 |
9 | 810 |
10 | 2224 |
11 | 6058 |
12 | 16408 |
13 | 44240 |
14 | 118848 |
15 | 318339 |
16 | 850608 |
17 | 2268206 |
18 | 6037892 |
19 | 16048945 |
20 | 42604344 |
21 | 112974302 |
22 | 299284044 |
23 | 792164740 |
24 | 2095161996 |
25 | 5537651796 |
26 | 14627504340 |
27 | 38616930931 |
28 | 101899265656 |
[0,0,0,1,4,12,36,104,292,810,2224,6058,16408, 44240,118848,318339,850608,2268206,6037892, 16048945,42604344,112974302,299284044,792164740, 2095161996,5537651796,14627504340,38616930931, 101899265656] |