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 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 24 |
| 5 | 73 |
| 6 | 246 |
| 7 | 913 |
| 8 | 3688 |
| 9 | 16057 |
| 10 | 74954 |
| 11 | 372749 |
| 12 | 1965156 |
| 13 | 10942285 |
| 14 | 64103006 |
| 15 | 393902353 |
| 16 | 2532010800 |
| 17 | 16982676561 |
| 18 | 118600412626 |
| 19 | 860680689429 |
| 20 | 6478753957948 |
| 21 | 50505684285301 |
| 22 | 407133297257542 |
| 23 | 3389160344023385 |
| 24 | 29098108436107592 |
| 25 | 257364794368638009 |