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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 6 |
| 7 | 11 |
| 8 | 22 |
| 9 | 44 |
| 10 | 92 |
| 11 | 92 |
| 12 | 157 |
| 13 | 311 |
| 14 | 622 |
| 15 | 1239 |
| 16 | 2478 |
| 17 | 4956 |
| 18 | 9912 |
| 19 | 19832 |
| 20 | 19832 |
| 21 | 36217 |
| 22 | 72058 |
| 23 | 144061 |
| 24 | 288122 |
| 25 | 576123 |
| 26 | 1152239 |
| 27 | 2304478 |
| 28 | 4608943 |