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 | 7 |
| 4 | 19 |
| 5 | 43 |
| 6 | 99 |
| 7 | 235 |
| 8 | 535 |
| 9 | 1239 |
| 10 | 2879 |
| 11 | 6619 |
| 12 | 15323 |
| 13 | 35451 |
| 14 | 81823 |
| 15 | 189263 |
| 16 | 437543 |
| 17 | 1011059 |
| 18 | 2337731 |
| 19 | 5403987 |
| 20 | 12491223 |
| 21 | 28877687 |
| 22 | 66755519 |
| 23 | 154315883 |
| 24 | 356738411 |
| 25 | 824668747 |
| 26 | 1906384015 |
| 27 | 4407016991 |
| 28 | 10187707927 |
| 29 | 23550975203 |