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 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 27 |
| 6 | 97 |
| 7 | 443 |
| 8 | 2095 |
| 9 | 10440 |
| 10 | 58194 |
| 11 | 340375 |
| 12 | 2097933 |
| 13 | 13847485 |
| 14 | 95504749 |
| 15 | 690495874 |
| 16 | 5245040408 |
| 17 | 41428115543 |
| 18 | 340899165549 |
| 19 | 2917641580783 |
| 20 | 25857170687507 |
| 21 | 237421321934176 |
| 22 | 2253720620740362 |
| 23 | 22073206655954547 |
| 24 | 222987346441156585 |
| 25 | 2319379362420267753 |