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 | 4 |
| 3 | 17 |
| 4 | 68 |
| 5 | 259 |
| 6 | 950 |
| 7 | 3387 |
| 8 | 11814 |
| 9 | 40503 |
| 10 | 136946 |
| 11 | 457795 |
| 12 | 1515926 |
| 13 | 4979777 |
| 14 | 16246924 |
| 15 | 52694573 |
| 16 | 170028792 |
| 17 | 546148863 |
| 18 | 1747255194 |
| 19 | 5569898331 |
| 20 | 17698806798 |
| 21 | 56076828573 |
| 22 | 177208108824 |
| 23 | 558658899825 |
| 24 | 1757365514652 |