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 | 5 |
| 2 | 48 |
| 3 | 396 |
| 4 | 2876 |
| 5 | 19591 |
| 6 | 128232 |
| 7 | 816009 |
| 8 | 5087814 |
| 9 | 31228804 |
| 10 | 189328186 |
| 11 | 1136393919 |
| 12 | 6764778660 |
| 13 | 39991075367 |
| 14 | 235019630164 |
| 15 | 1374139675314 |
| 16 | 7998875575940 |
| 17 | 46380134987289 |
| 18 | 267999333435856 |
| 19 | 1543818690094499 |
| 20 | 8868640131544198 |