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 | 4 |
| 1 | 14 |
| 2 | 49 |
| 3 | 172 |
| 4 | 604 |
| 5 | 2122 |
| 6 | 7456 |
| 7 | 26198 |
| 8 | 92052 |
| 9 | 323444 |
| 10 | 1136489 |
| 11 | 3993295 |
| 12 | 14031289 |
| 13 | 49301911 |
| 14 | 173232725 |
| 15 | 608689936 |
| 16 | 2138761243 |
| 17 | 7514991434 |
| 18 | 26405516950 |
| 19 | 92781386582 |
| 20 | 326007088306 |
| 21 | 1145495077635 |
| 22 | 4024940008834 |
| 23 | 14142480741305 |
| 24 | 49692606865991 |
| 25 | 174605518105877 |