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 | 30 |
| 2 | 51319 |
| 3 | 3882139 |
| 4 | 289022911 |
| 5 | 674910259 |
| 6 | 991523479 |
| 7 | 1893583519 |
| 8 | 4550912389 |
| 9 | 9761467669 |
| 10 | 16721570539 |
| 11 | 28685399311 |
| 12 | 72886214809 |
| 13 | 77372307511 |
| 14 | 82720376839 |
| 15 | 98685849571 |
| 16 | 173850108931 |
| 17 | 220038912319 |
| 18 | 229352039821 |
| 19 | 240313142749 |
| 20 | 257401051861 |
| 21 | 428178002569 |