n | a(n) |
---|---|
1 | 4 |
2 | 10 |
3 | 30 |
4 | 90 |
5 | 294 |
6 | 964 |
7 | 3304 |
8 | 11464 |
9 | 40584 |
10 | 145338 |
11 | 526638 |
12 | 1924378 |
13 | 7086598 |
14 | 26259388 |
15 | 97842104 |
16 | 366273464 |
17 | 1376854004 |
18 | 5194587924 |
19 | 19661846184 |
20 | 74637375132 |
21 | 284068160592 |
22 | 1083712790142 |
23 | 4143223406562 |
24 | 15871346734402 |
25 | 60907343008066 |
26 | 234122710710436 |
[4,10,30,90,294,964,3304,11464,40584,145338, 526638,1924378,7086598,26259388,97842104, 366273464,1376854004,5194587924,19661846184, 74637375132,284068160592,1083712790142, 4143223406562,15871346734402,60907343008066, 234122710710436] |