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 | 1 |
| 2 | 21 |
| 3 | 273 |
| 4 | 2231 |
| 5 | 10101 |
| 6 | 28261 |
| 7 | 611123 |
| 8 | 1200341 |
| 9 | 3427673 |
| 10 | 8108919 |
| 11 | 38636301 |
| 12 | 51484647 |
| 13 | 2202416417 |
| 14 | 11102657671 |
| 15 | 42822560781 |