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 | 15 |
| 3 | 27 |
| 4 | 117 |
| 5 | 259 |
| 6 | 507 |
| 7 | 3315 |
| 8 | 4489 |
| 9 | 4875 |
| 10 | 15849 |
| 11 | 19807 |
| 12 | 23799 |
| 13 | 36315 |
| 14 | 37915 |
| 15 | 47331 |
| 16 | 211219 |