n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 8 |
3 | 20 |
4 | 60 |
5 | 188 |
6 | 632 |
7 | 2192 |
8 | 7712 |
9 | 27596 |
10 | 99880 |
11 | 364724 |
12 | 1342184 |
13 | 4971068 |
14 | 18512792 |
15 | 69273668 |
16 | 260301176 |
17 | 981706832 |
18 | 3714566312 |
19 | 14096303344 |
20 | 53634713552 |
21 | 204560302844 |
22 | 781874936816 |
23 | 2994414645860 |
24 | 11488774559636 |
[2,4,8,20,60,188,632,2192,7712,27596,99880,364724, 1342184,4971068,18512792,69273668,260301176, 981706832,3714566312,14096303344,53634713552, 204560302844,781874936816,2994414645860, 11488774559636] |