n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 33 |
4 | 96 |
5 | 317 |
6 | 1218 |
7 | 5425 |
8 | 27608 |
9 | 158129 |
10 | 1006574 |
11 | 7048657 |
12 | 53847420 |
13 | 445643681 |
14 | 3971876930 |
15 | 37928628529 |
16 | 386337833232 |
17 | 4181155148673 |
18 | 47912508680086 |
19 | 579538956964241 |
20 | 7378919177090244 |
21 | 98648882783190305 |
[1,4,12,33,96,317,1218,5425,27608,158129,1006574, 7048657,53847420,445643681,3971876930,37928628529, 386337833232,4181155148673,47912508680086, 579538956964241,7378919177090244, 98648882783190305] |