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 | 5 |
| 2 | 7 |
| 3 | 15 |
| 4 | 27 |
| 5 | 57 |
| 6 | 114 |
| 7 | 243 |
| 8 | 506 |
| 9 | 1102 |
| 10 | 2381 |
| 11 | 5269 |
| 12 | 11686 |
| 13 | 26277 |
| 14 | 59348 |
| 15 | 135317 |
| 16 | 310064 |
| 17 | 715475 |
| 18 | 1659321 |
| 19 | 3870414 |
| 20 | 9071915 |
| 21 | 21372782 |
| 22 | 50591199 |
| 23 | 120332237 |