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 | 1 |
| 2 | 9 |
| 3 | 25 |
| 4 | 49 |
| 5 | 149 |
| 6 | 625 |
| 7 | 2141 |
| 8 | 5433 |
| 9 | 17269 |
| 10 | 65249 |
| 11 | 214877 |
| 12 | 600025 |
| 13 | 1934485 |
| 14 | 6961153 |
| 15 | 22488637 |
| 16 | 66171721 |
| 17 | 214994149 |
| 18 | 746222545 |
| 19 | 2392193165 |
| 20 | 7273608601 |
| 21 | 23705004725 |
| 22 | 80233190113 |
| 23 | 256613628509 |
| 24 | 797094034921 |
| 25 | 2598493640773 |
| 26 | 8647653815601 |