n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 8 |
3 | 20 |
4 | 52 |
5 | 152 |
6 | 472 |
7 | 1520 |
8 | 5044 |
9 | 17112 |
10 | 59008 |
11 | 206260 |
12 | 729096 |
13 | 2601640 |
14 | 9358944 |
15 | 33904324 |
16 | 123580884 |
17 | 452902072 |
18 | 1667837680 |
19 | 6168510256 |
20 | 22903260088 |
21 | 85338450344 |
22 | 318995297200 |
23 | 1195901750512 |
24 | 4495448217544 |
25 | 16940411201280 |
26 | 63983233268592 |
[2,4,8,20,52,152,472,1520,5044,17112,59008,206260, 729096,2601640,9358944,33904324,123580884, 452902072,1667837680,6168510256,22903260088, 85338450344,318995297200,1195901750512, 4495448217544,16940411201280,63983233268592] |