This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 5 |
| 7 | 11 |
| 8 | 19 |
| 9 | 43 |
| 10 | 75 |
| 11 | 155 |
| 12 | 287 |
| 13 | 567 |
| 14 | 1053 |
| 15 | 2063 |
| 16 | 3859 |
| 17 | 7455 |
| 18 | 14089 |
| 19 | 27083 |
| 20 | 51463 |
| 21 | 98855 |
| 22 | 188697 |
| 23 | 362675 |
| 24 | 695155 |
| 25 | 1338087 |
| 26 | 2573235 |
| 27 | 4962875 |
| 28 | 9571195 |
| 29 | 18496407 |
| 30 | 35759799 |
| 31 | 69240899 |
| 32 | 134154259 |
| 33 | 260235639 |
| 34 | 505163055 |
| 35 | 981575759 |
| 36 | 1908619755 |
| 37 | 3714304167 |
| 38 | 7233118641 |
| 39 | 14095779055 |