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 | 3 |
| 2 | 5 |
| 3 | 11 |
| 4 | 25 |
| 5 | 55 |
| 6 | 121 |
| 7 | 270 |
| 8 | 599 |
| 9 | 1331 |
| 10 | 2961 |
| 11 | 6584 |
| 12 | 14641 |
| 13 | 32562 |
| 14 | 72416 |
| 15 | 161051 |
| 16 | 358175 |
| 17 | 796573 |
| 18 | 1771561 |
| 19 | 3939917 |
| 20 | 8762296 |
| 21 | 19487171 |
| 22 | 43339081 |
| 23 | 96385252 |
| 24 | 214358881 |
| 25 | 476729884 |
| 26 | 1060237770 |
| 27 | 2357947691 |
| 28 | 5244028720 |
| 29 | 11662615467 |
| 30 | 25937424601 |