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 | 29 |
| 2 | 89 |
| 3 | 269 |
| 4 | 809 |
| 5 | 2429 |
| 6 | 7289 |
| 7 | 21869 |
| 8 | 65609 |
| 9 | 196829 |
| 10 | 590489 |
| 11 | 1771469 |
| 12 | 5314409 |
| 13 | 15943229 |
| 14 | 47829689 |
| 15 | 143489069 |
| 16 | 430467209 |
| 17 | 1291401629 |
| 18 | 3874204889 |
| 19 | 11622614669 |
| 20 | 34867844009 |
| 21 | 104603532029 |
| 22 | 313810596089 |
| 23 | 941431788269 |
| 24 | 2824295364809 |