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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 31 |
| 4 | 111 |
| 5 | 351 |
| 6 | 1151 |
| 7 | 3711 |
| 8 | 12031 |
| 9 | 38911 |
| 10 | 125951 |
| 11 | 407551 |
| 12 | 1318911 |
| 13 | 4268031 |
| 14 | 13811711 |
| 15 | 44695551 |
| 16 | 144637951 |
| 17 | 468058111 |
| 18 | 1514668031 |
| 19 | 4901568511 |
| 20 | 15861809151 |
| 21 | 51329892351 |
| 22 | 166107021311 |
| 23 | 537533612031 |
| 24 | 1739495309311 |
| 25 | 5629125066751 |
| 26 | 18216231370751 |