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 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 16 |
| 5 | 37 |
| 6 | 89 |
| 7 | 216 |
| 8 | 529 |
| 9 | 1307 |
| 10 | 3248 |
| 11 | 8111 |
| 12 | 20339 |
| 13 | 51176 |
| 14 | 129143 |
| 15 | 326717 |
| 16 | 828374 |
| 17 | 2104361 |
| 18 | 5354979 |
| 19 | 13647682 |
| 20 | 34830191 |
| 21 | 89000157 |
| 22 | 227674188 |
| 23 | 583017657 |
| 24 | 1494365341 |
| 25 | 3833592212 |
| 26 | 9842373849 |
| 27 | 25287895051 |
| 28 | 65016153154 |
| 29 | 167264946727 |