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 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 114 |
| 9 | 282 |
| 10 | 703 |
| 11 | 1787 |
| 12 | 4583 |
| 13 | 11900 |
| 14 | 31131 |
| 15 | 82117 |
| 16 | 217954 |
| 17 | 581970 |
| 18 | 1561704 |
| 19 | 4210263 |
| 20 | 11396488 |
| 21 | 30963024 |
| 22 | 84402984 |
| 23 | 230779071 |
| 24 | 632762424 |
| 25 | 1739387089 |