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) |
|---|---|
| 0 | 3 |
| 1 | 3 |
| 2 | 4 |
| 3 | 7 |
| 4 | 15 |
| 5 | 26 |
| 6 | 64 |
| 7 | 132 |
| 8 | 253 |
| 9 | 498 |
| 10 | 1033 |
| 11 | 2027 |
| 12 | 4089 |
| 13 | 8141 |
| 14 | 16416 |
| 15 | 32715 |
| 16 | 65722 |
| 17 | 131374 |
| 18 | 262159 |
| 19 | 524211 |
| 20 | 1048630 |
| 21 | 2097291 |
| 22 | 4195039 |
| 23 | 8387885 |