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 | 7 |
| 3 | 21 |
| 4 | 59 |
| 5 | 184 |
| 6 | 534 |
| 7 | 1620 |
| 8 | 4889 |
| 9 | 15607 |
| 10 | 50138 |
| 11 | 165569 |
| 12 | 551580 |
| 13 | 1860565 |
| 14 | 6345080 |