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 | 5 |
| 4 | 11 |
| 5 | 25 |
| 6 | 59 |
| 7 | 145 |
| 8 | 367 |
| 9 | 949 |
| 10 | 2495 |
| 11 | 6645 |
| 12 | 17883 |
| 13 | 48541 |
| 14 | 132711 |
| 15 | 365073 |
| 16 | 1009647 |
| 17 | 2805365 |
| 18 | 7827167 |
| 19 | 21918997 |
| 20 | 61584891 |
| 21 | 173550677 |
| 22 | 490408623 |
| 23 | 1389206065 |
| 24 | 3944231887 |
| 25 | 11221911849 |
| 26 | 31989733339 |
| 27 | 91354992405 |
| 28 | 261322661051 |