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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 19 |
| 5 | 41 |
| 6 | 87 |
| 7 | 181 |
| 8 | 363 |
| 9 | 729 |
| 10 | 1463 |
| 11 | 2933 |
| 12 | 5871 |
| 13 | 11753 |
| 14 | 23523 |
| 15 | 47061 |
| 16 | 94123 |
| 17 | 188249 |
| 18 | 376503 |
| 19 | 753013 |
| 20 | 1506031 |
| 21 | 3012073 |