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 | 29 |
| 3 | 90 |
| 4 | 283 |
| 5 | 895 |
| 6 | 2829 |
| 7 | 8945 |
| 8 | 28285 |
| 9 | 89443 |
| 10 | 282843 |
| 11 | 894428 |
| 12 | 2828428 |
| 13 | 8944272 |
| 14 | 28284272 |
| 15 | 89442720 |
| 16 | 282842713 |
| 17 | 894427191 |
| 18 | 2828427125 |
| 19 | 8944271910 |
| 20 | 28284271248 |
| 21 | 89442719100 |
| 22 | 282842712475 |
| 23 | 894427191000 |
| 24 | 2828427124747 |