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 | 315 |
| 2 | 2755 |
| 3 | 14119 |
| 4 | 53739 |
| 5 | 247879 |
| 6 | 904411 |
| 7 | 2909367 |