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 | 9 |
| 4 | 27 |
| 5 | 79 |
| 6 | 233 |
| 7 | 687 |
| 8 | 2025 |
| 9 | 5969 |
| 10 | 17595 |
| 11 | 51865 |
| 12 | 152883 |
| 13 | 450655 |
| 14 | 1328401 |
| 15 | 3915743 |
| 16 | 11542481 |
| 17 | 34023905 |
| 18 | 100292659 |
| 19 | 295633833 |
| 20 | 871443275 |
| 21 | 2568763439 |
| 22 | 7571973753 |
| 23 | 22319994767 |
| 24 | 65792907193 |
| 25 | 193938514865 |
| 26 | 571674807403 |
| 27 | 1685132453689 |
| 28 | 4967284459107 |