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 | 4 |
| 2 | 47 |
| 3 | 509 |
| 4 | 5273 |
| 5 | 53047 |
| 6 | 532887 |
| 7 | 5356259 |
| 8 | 53765483 |
| 9 | 539119753 |
| 10 | 5402600081 |
| 11 | 54118210435 |
| 12 | 541947386821 |
| 13 | 5425907665571 |
| 14 | 54313871643797 |
| 15 | 543611236251491 |
| 16 | 5440228524355329 |
| 17 | 54438462600610510 |
| 18 | 544705097744731559 |
| 19 | 5449909581264135103 |