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 | 4 |
| 3 | 10 |
| 4 | 44 |
| 5 | 197 |
| 6 | 1228 |
| 7 | 7692 |
| 8 | 52828 |
| 9 | 373636 |
| 10 | 2735952 |
| 11 | 20506258 |
| 12 | 156922676 |
| 13 | 1221179926 |
| 14 | 9642496488 |
| 15 | 77092885016 |
| 16 | 623121750844 |
| 17 | 5085013101164 |
| 18 | 41850600967984 |
| 19 | 347060754685888 |
| 20 | 2897800158952304 |
| 21 | 24344668688424333 |
| 22 | 205667187527660076 |
| 23 | 1746375819789491996 |
| 24 | 14898241072028602276 |