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 | 8 |
| 4 | 77 |
| 5 | 232 |
| 6 | 555 |
| 7 | 2992 |
| 8 | 15751 |
| 9 | 41314 |
| 10 | 92529 |
| 11 | 1049401 |
| 12 | 3097903 |
| 13 | 7193917 |
| 14 | 63855836 |
| 15 | 227696722 |
| 16 | 555373555 |
| 17 | 3107337013 |
| 18 | 16214541261 |
| 19 | 42428982424 |
| 20 | 94857775849 |
| 21 | 1097153517901 |
| 22 | 3194305034913 |
| 23 | 7388609068837 |
| 24 | 67772177127776 |