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 | 3 |
| 2 | 5 |
| 3 | 353 |
| 4 | 33533 |
| 5 | 35353 |
| 6 | 3353533 |
| 7 | 3553553 |
| 8 | 333535333 |
| 9 | 335333533 |
| 10 | 355353553 |
| 11 | 355555553 |
| 12 | 33335353333 |
| 13 | 33553335533 |
| 14 | 35533333553 |
| 15 | 35553535553 |
| 16 | 3335535355333 |
| 17 | 3335555555333 |
| 18 | 3353353533533 |
| 19 | 3353355533533 |
| 20 | 3355535355533 |
| 21 | 3533355533353 |
| 22 | 3533533353353 |