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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 32 |
| 7 | 79 |
| 8 | 193 |
| 9 | 478 |
| 10 | 1196 |
| 11 | 3037 |
| 12 | 7802 |
| 13 | 20287 |
| 14 | 53259 |
| 15 | 141069 |
| 16 | 376449 |
| 17 | 1011295 |
| 18 | 2732453 |
| 19 | 7421128 |
| 20 | 20247355 |