n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 23 |
6 | 51 |
7 | 133 |
8 | 399 |
9 | 1321 |
10 | 4129 |
11 | 12457 |
12 | 38059 |
13 | 114177 |
14 | 349017 |
15 | 1056893 |
16 | 3188001 |
17 | 9592717 |
18 | 28778151 |
19 | 86390521 |
20 | 259279771 |
21 | 778196971 |
22 | 2334819901 |
23 | 7004459703 |
24 | 21010336329 |
25 | 63026931713 |
26 | 189077563341 |
27 | 567218511883 |
[1,1,3,9,23,51,133,399,1321,4129,12457,38059, 114177,349017,1056893,3188001,9592717,28778151, 86390521,259279771,778196971,2334819901, 7004459703,21010336329,63026931713,189077563341, 567218511883] |