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 | 1 |
| 2 | 46 |
| 3 | 8910 |
| 4 | 12141516 |
| 5 | 1820212224 |
| 6 | 252627283032 |
| 7 | 33343536383940 |
| 8 | 4244454648495051 |
| 9 | 525455565758606263 |
| 10 | 64656668697072747576 |
| 11 | 7778808182848586878890 |
| 12 | 9192939495969899100102104105 |
| 13 | 106108110111112114115116117118119120121 |