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 | 10 |
| 3 | 21 |
| 4 | 44 |
| 5 | 83 |
| 6 | 218 |
| 7 | 271 |
| 8 | 692 |
| 9 | 865 |
| 10 | 2622 |
| 11 | 2813 |
| 12 | 9220 |
| 13 | 9735 |
| 14 | 35214 |
| 15 | 35911 |
| 16 | 135564 |
| 17 | 136899 |
| 18 | 533290 |
| 19 | 535081 |