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 | 4 |
| 2 | 10 |
| 3 | 29 |
| 4 | 84 |
| 5 | 248 |
| 6 | 737 |
| 7 | 2200 |
| 8 | 6582 |
| 9 | 19717 |
| 10 | 59104 |
| 11 | 177236 |
| 12 | 531585 |
| 13 | 1594556 |
| 14 | 4783346 |
| 15 | 14349517 |
| 16 | 43047708 |
| 17 | 129141760 |
| 18 | 387423073 |
| 19 | 1162265648 |
| 20 | 3486791166 |
| 21 | 10460364149 |
| 22 | 31381077320 |
| 23 | 94143207484 |
| 24 | 282429582849 |
| 25 | 847288684468 |
| 26 | 2541865949722 |
| 27 | 7625597681405 |