n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 8 |
4 | 47 |
5 | 244 |
6 | 1186 |
7 | 5536 |
8 | 25147 |
9 | 112028 |
10 | 491870 |
11 | 2135440 |
12 | 9188406 |
13 | 39249768 |
14 | 166656772 |
15 | 704069248 |
16 | 2961699667 |
17 | 12412521388 |
18 | 51854046982 |
19 | 216013684528 |
20 | 897632738722 |
21 | 3721813363288 |
22 | 15401045060572 |
23 | 63616796642368 |
24 | 262357557683422 |
25 | 1080387930269464 |
26 | 4443100381114156 |
[0,0,1,8,47,244,1186,5536,25147,112028,491870, 2135440,9188406,39249768,166656772,704069248, 2961699667,12412521388,51854046982,216013684528, 897632738722,3721813363288,15401045060572, 63616796642368,262357557683422,1080387930269464, 4443100381114156] |