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 | 45 |
| 2 | 78 |
| 3 | 4950 |
| 4 | 5253 |
| 5 | 295296 |
| 6 | 369370 |
| 7 | 415416 |
| 8 | 499500 |
| 9 | 502503 |
| 10 | 594595 |
| 11 | 652653 |
| 12 | 760761 |
| 13 | 22542255 |
| 14 | 49995000 |
| 15 | 50025003 |
| 16 | 88278828 |
| 17 | 1033010331 |
| 18 | 1487714878 |
| 19 | 4999950000 |
| 20 | 5000250003 |
| 21 | 490150490151 |
| 22 | 499999500000 |
| 23 | 500002500003 |
| 24 | 509949509950 |
| 25 | 33471093347110 |
| 26 | 49999995000000 |
| 27 | 50000025000003 |