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 | 50 |
| 3 | 56 |
| 4 | 60 |
| 5 | 90 |
| 6 | 4900 |
| 7 | 5100 |
| 8 | 7500 |
| 9 | 7600 |
| 10 | 9900 |
| 11 | 12500 |
| 12 | 499000 |
| 13 | 501000 |
| 14 | 624000 |
| 15 | 625000 |
| 16 | 749000 |
| 17 | 751000 |
| 18 | 875000 |
| 19 | 999000 |
| 20 | 1249000 |
| 21 | 13427757 |
| 22 | 49990000 |
| 23 | 50010000 |
| 24 | 56250000 |
| 25 | 62490000 |