n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 20 |
4 | 136 |
5 | 392 |
6 | 1408 |
7 | 4544 |
8 | 15040 |
9 | 48896 |
10 | 159232 |
11 | 516608 |
12 | 1675264 |
13 | 5427200 |
14 | 17575936 |
15 | 56901632 |
16 | 184188928 |
17 | 596148224 |
18 | 1929379840 |
19 | 6244007936 |
20 | 20206845952 |
21 | 65392345088 |
22 | 211617316864 |
23 | 684814499840 |
24 | 2216119238656 |
[1,4,12,20,136,392,1408,4544,15040,48896,159232, 516608,1675264,5427200,17575936,56901632, 184188928,596148224,1929379840,6244007936, 20206845952,65392345088,211617316864,684814499840, 2216119238656] |