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 | 9 |
| 2 | 90 |
| 3 | 657 |
| 4 | 4788 |
| 5 | 27225 |
| 6 | 146619 |
| 7 | 544329 |
| 8 | 2112084 |
| 9 | 3447369 |
| 10 | 28995255 |
| 11 | 9 |
| 12 | 1488185631 |
| 13 | 9 |
| 14 | 73556822205 |
| 15 | 38222232057 |
| 16 | 3321970172244 |
| 17 | 9 |
| 18 | 138479121435807 |
| 19 | 9 |
| 20 | 2209806802214163 |
| 21 | 19711054740199689 |
| 22 | 28570005 |
| 23 | 9 |
| 24 | 15574715941421647071 |
| 25 | 141378216540777225 |
| 26 | 421224309 |
| 27 | 9724427617362202602009 |