n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 28 |
5 | 80 |
6 | 228 |
7 | 648 |
8 | 1840 |
9 | 5224 |
10 | 14832 |
11 | 42112 |
12 | 119568 |
13 | 339488 |
14 | 963904 |
15 | 2736800 |
16 | 7770560 |
17 | 22062848 |
18 | 62642752 |
19 | 177860736 |
20 | 504997632 |
21 | 1433833088 |
22 | 4071063296 |
23 | 11558916096 |
24 | 32819077376 |
25 | 93182771712 |
26 | 264572609536 |
[1,2,4,10,28,80,228,648,1840,5224,14832,42112, 119568,339488,963904,2736800,7770560,22062848, 62642752,177860736,504997632,1433833088, 4071063296,11558916096,32819077376,93182771712, 264572609536] |