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 | 13 |
| 3 | 34 |
| 4 | 84 |
| 5 | 203 |
| 6 | 493 |
| 7 | 1186 |
| 8 | 2876 |
| 9 | 6915 |
| 10 | 16765 |
| 11 | 40306 |
| 12 | 97716 |
| 13 | 234923 |
| 14 | 569533 |
| 15 | 1369234 |
| 16 | 3319484 |
| 17 | 7980483 |
| 18 | 19347373 |
| 19 | 46513666 |