n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 32 |
4 | 90 |
5 | 312 |
6 | 1288 |
7 | 5504 |
8 | 22608 |
9 | 88660 |
10 | 339064 |
11 | 1297056 |
12 | 5043376 |
13 | 19975256 |
14 | 80027280 |
15 | 321692928 |
16 | 1291650786 |
17 | 5177295432 |
18 | 20748447108 |
19 | 83279292960 |
20 | 335056780464 |
21 | 1351064867328 |
22 | 5456890474248 |
23 | 22063059606912 |
[1,4,12,32,90,312,1288,5504,22608,88660,339064, 1297056,5043376,19975256,80027280,321692928, 1291650786,5177295432,20748447108,83279292960, 335056780464,1351064867328,5456890474248, 22063059606912] |