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 | 133999337137 |
| 2 | 139779933779 |
| 3 | 173139331177 |
| 4 | 173399913979 |
| 5 | 177793993177 |
| 6 | 179993739971 |
| 7 | 391331737931 |
| 8 | 771319973999 |
| 9 | 917377131371 |
| 10 | 933971311913 |
| 11 | 997331911711 |
| 12 | 1191777377177 |
| 13 | 9311933973733 |
| 14 | 9979333919939 |
| 15 | 19979113377173 |
| 16 | 31997131171111 |
| 17 | 37137197179931 |
| 18 | 37337319113911 |