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 | 0 |
| 2 | 2 |
| 3 | 23 |
| 4 | 24 |
| 5 | 25 |
| 6 | 2346 |
| 7 | 2369 |
| 8 | 24510 |
| 9 | 2346812 |
| 10 | 23561015 |
| 11 | 234691218 |
| 12 | 23468121624 |
| 13 | 234561012152030 |
| 14 | 234671214212842 |
| 15 | 235691015183045 |
| 16 | 2345681012152024304060 |
| 17 | 2346781214212428425684 |
| 18 | 23456910121518203036456090 |