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 | 5 |
| 2 | 25 |
| 3 | 95 |
| 4 | 295 |
| 5 | 821 |
| 6 | 2227 |
| 7 | 6254 |
| 8 | 18394 |
| 9 | 55285 |
| 10 | 165563 |
| 11 | 489488 |
| 12 | 1433536 |
| 13 | 4188613 |
| 14 | 12268735 |
| 15 | 36052642 |
| 16 | 106118146 |
| 17 | 312319987 |
| 18 | 918413167 |
| 19 | 2698818913 |
| 20 | 7929048609 |
| 21 | 23298823959 |
| 22 | 68477103061 |
| 23 | 201284983126 |
| 24 | 591668573686 |
| 25 | 1739085580405 |