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 | 7 |
| 3 | 19 |
| 4 | 55 |
| 5 | 165 |
| 6 | 493 |
| 7 | 1477 |
| 8 | 4429 |
| 9 | 13287 |
| 10 | 39859 |
| 11 | 119575 |
| 12 | 358723 |
| 13 | 1076169 |
| 14 | 3228505 |
| 15 | 9685513 |
| 16 | 29056537 |