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 | 1 |
| 3 | 28 |
| 4 | 92 |
| 5 | 342 |
| 6 | 990 |
| 7 | 2705 |
| 8 | 6801 |
| 9 | 16278 |
| 10 | 37278 |
| 11 | 82532 |
| 12 | 177572 |
| 13 | 373105 |
| 14 | 768241 |
| 15 | 1554616 |
| 16 | 3098808 |
| 17 | 6095738 |
| 18 | 11851922 |
| 19 | 22805745 |
| 20 | 43477745 |
| 21 | 82197986 |
| 22 | 154231706 |
| 23 | 287411688 |
| 24 | 532248552 |
| 25 | 980014177 |
| 26 | 1794978145 |
| 27 | 3271695220 |
| 28 | 5936514356 |
| 29 | 10726952958 |