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 | 3 |
| 2 | 10 |
| 3 | 31 |
| 4 | 96 |
| 5 | 306 |
| 6 | 967 |
| 7 | 3058 |
| 8 | 9670 |
| 9 | 30579 |
| 10 | 96700 |
| 11 | 305793 |
| 12 | 967000 |
| 13 | 3057922 |
| 14 | 9670000 |
| 15 | 30579224 |
| 16 | 96699996 |
| 17 | 305792239 |
| 18 | 966999967 |
| 19 | 3057922393 |
| 20 | 9669999669 |
| 21 | 30579223926 |
| 22 | 96699996687 |
| 23 | 305792239263 |
| 24 | 966999966873 |
| 25 | 3057922392627 |
| 26 | 9669999668731 |
| 27 | 30579223926265 |