n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 14 |
4 | 40 |
5 | 116 |
6 | 344 |
7 | 1016 |
8 | 2992 |
9 | 8816 |
10 | 25984 |
11 | 76576 |
12 | 225664 |
13 | 665024 |
14 | 1959808 |
15 | 5775488 |
16 | 17020160 |
17 | 50157824 |
18 | 147813376 |
19 | 435600896 |
20 | 1283700736 |
21 | 3783021568 |
22 | 11148433408 |
23 | 32854046720 |
24 | 96819736576 |
25 | 285324406784 |
26 | 840841134080 |
[1,4,14,40,116,344,1016,2992,8816,25984,76576, 225664,665024,1959808,5775488,17020160,50157824, 147813376,435600896,1283700736,3783021568, 11148433408,32854046720,96819736576,285324406784, 840841134080] |