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 | 9 |
| 1 | 10 |
| 2 | 89 |
| 3 | 99 |
| 4 | 1871 |
| 5 | 1970 |
| 6 | 17631 |
| 7 | 19601 |
| 8 | 370449 |
| 9 | 390050 |
| 10 | 3490849 |
| 11 | 3880899 |
| 12 | 73347031 |
| 13 | 77227930 |
| 14 | 691170471 |
| 15 | 768398401 |
| 16 | 14522341689 |
| 17 | 15290740090 |
| 18 | 136848262409 |
| 19 | 152139002499 |
| 20 | 2875350307391 |
| 21 | 3027489309890 |