n | a(n) |
---|---|
0 | 4 |
1 | 8 |
2 | 20 |
3 | 56 |
4 | 164 |
5 | 488 |
6 | 1460 |
7 | 4376 |
8 | 13124 |
9 | 39368 |
10 | 118100 |
11 | 354296 |
12 | 1062884 |
13 | 3188648 |
14 | 9565940 |
15 | 28697816 |
16 | 86093444 |
17 | 258280328 |
18 | 774840980 |
19 | 2324522936 |
20 | 6973568804 |
21 | 20920706408 |
22 | 62762119220 |
23 | 188286357656 |
24 | 564859072964 |
25 | 1694577218888 |
26 | 5083731656660 |
27 | 15251194969976 |
[4,8,20,56,164,488,1460,4376,13124,39368,118100, 354296,1062884,3188648,9565940,28697816,86093444, 258280328,774840980,2324522936,6973568804, 20920706408,62762119220,188286357656,564859072964, 1694577218888,5083731656660,15251194969976] |