n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 132 |
5 | 492 |
6 | 1932 |
7 | 7596 |
8 | 30252 |
9 | 120516 |
10 | 481572 |
11 | 1924356 |
12 | 7695492 |
13 | 30774372 |
14 | 123089892 |
15 | 492329316 |
16 | 1969287012 |
17 | 7877027532 |
18 | 31507989612 |
19 | 126031476876 |
20 | 504125425932 |
21 | 2016499779372 |
22 | 8065997193132 |
23 | 32263981077036 |
24 | 129055916612652 |
25 | 516223635676236 |
[0,4,12,36,132,492,1932,7596,30252,120516,481572, 1924356,7695492,30774372,123089892,492329316, 1969287012,7877027532,31507989612,126031476876, 504125425932,2016499779372,8065997193132, 32263981077036,129055916612652,516223635676236] |