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 | 4 |
| 2 | 44 |
| 3 | 319 |
| 4 | 2204 |
| 5 | 15124 |
| 6 | 103679 |
| 7 | 710644 |
| 8 | 4870844 |
| 9 | 33385279 |
| 10 | 228826124 |
| 11 | 1568397604 |
| 12 | 10749957119 |
| 13 | 73681302244 |
| 14 | 505019158604 |
| 15 | 3461452807999 |
| 16 | 23725150497404 |
| 17 | 162614600673844 |
| 18 | 1114577054219519 |
| 19 | 7639424778862804 |
| 20 | 52361396397820124 |
| 21 | 358890350005878079 |