n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 9 |
4 | 28 |
5 | 75 |
6 | 211 |
7 | 577 |
8 | 1591 |
9 | 4367 |
10 | 12004 |
11 | 32975 |
12 | 90607 |
13 | 248931 |
14 | 683946 |
15 | 1879112 |
16 | 5162835 |
17 | 14184754 |
18 | 38972316 |
19 | 107075529 |
20 | 294187633 |
21 | 808273837 |
22 | 2220714167 |
23 | 6101361970 |
24 | 16763354312 |
25 | 46056937364 |
26 | 126540395519 |
[1,4,9,28,75,211,577,1591,4367,12004,32975,90607, 248931,683946,1879112,5162835,14184754,38972316, 107075529,294187633,808273837,2220714167, 6101361970,16763354312,46056937364,126540395519] |