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 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 46 |
| 5 | 156 |
| 6 | 476 |
| 7 | 1349 |
| 8 | 3571 |
| 9 | 8939 |
| 10 | 21310 |
| 11 | 48701 |
| 12 | 107233 |
| 13 | 228465 |
| 14 | 472626 |
| 15 | 952169 |
| 16 | 1872813 |
| 17 | 3604103 |
| 18 | 6798753 |
| 19 | 12592030 |
| 20 | 22930495 |
| 21 | 41108069 |
| 22 | 72630552 |
| 23 | 126596216 |
| 24 | 217879554 |
| 25 | 370555433 |
| 26 | 623223294 |
| 27 | 1037221437 |
| 28 | 1709205913 |