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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 33 |
| 4 | 101 |
| 5 | 303 |
| 6 | 911 |
| 7 | 2733 |
| 8 | 8201 |
| 9 | 24603 |
| 10 | 73811 |
| 11 | 221433 |
| 12 | 664301 |
| 13 | 1992903 |
| 14 | 5978711 |
| 15 | 17936133 |
| 16 | 53808401 |
| 17 | 161425203 |
| 18 | 484275611 |
| 19 | 1452826833 |
| 20 | 4358480501 |
| 21 | 13075441503 |
| 22 | 39226324511 |
| 23 | 117678973533 |
| 24 | 353036920601 |
| 25 | 1059110761803 |