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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 21 |
| 5 | 61 |
| 6 | 203 |
| 7 | 724 |
| 8 | 2600 |
| 9 | 9291 |
| 10 | 33525 |
| 11 | 123537 |
| 12 | 463796 |
| 13 | 1759184 |
| 14 | 6706976 |
| 15 | 25696524 |
| 16 | 99069838 |
| 17 | 384429159 |
| 18 | 1499778661 |
| 19 | 5875513183 |
| 20 | 23099489574 |
| 21 | 91123553946 |
| 22 | 360649997698 |
| 23 | 1431724692900 |
| 24 | 5699142280127 |
| 25 | 22741352276386 |
| 26 | 90949212893978 |