n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 28 |
5 | 83 |
6 | 227 |
7 | 626 |
8 | 1644 |
9 | 4290 |
10 | 11322 |
11 | 28965 |
12 | 74469 |
13 | 189436 |
14 | 471910 |
15 | 1166247 |
16 | 2884920 |
17 | 7130085 |
18 | 17349489 |
19 | 42180190 |
20 | 101820577 |
21 | 242907065 |
22 | 579402163 |
23 | 1375056009 |
24 | 3262651085 |
25 | 7768448187 |
26 | 18411720785 |
[1,2,4,10,28,83,227,626,1644,4290,11322,28965, 74469,189436,471910,1166247,2884920,7130085, 17349489,42180190,101820577,242907065,579402163, 1375056009,3262651085,7768448187,18411720785] |