n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 100 |
5 | 300 |
6 | 776 |
7 | 2412 |
8 | 6304 |
9 | 19036 |
10 | 50952 |
11 | 148896 |
12 | 393452 |
13 | 1211444 |
14 | 3167004 |
15 | 9672772 |
16 | 25295248 |
17 | 76084796 |
18 | 200590424 |
19 | 608621376 |
20 | 1617201648 |
21 | 4908511140 |
22 | 12658776540 |
23 | 38907904188 |
24 | 102775961200 |
25 | 310485090044 |
[1,4,12,36,100,300,776,2412,6304,19036,50952, 148896,393452,1211444,3167004,9672772,25295248, 76084796,200590424,608621376,1617201648, 4908511140,12658776540,38907904188,102775961200, 310485090044] |