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 | 289 |
| 2 | 529 |
| 3 | 1369 |
| 4 | 4225 |
| 5 | 13225 |
| 6 | 42025 |
| 7 | 139129 |
| 8 | 444889 |
| 9 | 1423249 |
| 10 | 4721929 |
| 11 | 15108769 |
| 12 | 48344209 |
| 13 | 160402225 |
| 14 | 513249025 |
| 15 | 1642275625 |
| 16 | 5448949489 |
| 17 | 17435353849 |
| 18 | 55789022809 |
| 19 | 185103876169 |
| 20 | 592288777609 |
| 21 | 1895184495649 |
| 22 | 6288082836025 |