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 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 54 |
| 6 | 190 |
| 7 | 684 |
| 8 | 2505 |
| 9 | 9291 |
| 10 | 34793 |
| 11 | 131277 |
| 12 | 498312 |
| 13 | 1900862 |
| 14 | 7280732 |
| 15 | 27983141 |
| 16 | 107868939 |
| 17 | 416869874 |
| 18 | 1614609446 |
| 19 | 6265869591 |
| 20 | 24358231651 |
| 21 | 94837442844 |
| 22 | 369755864507 |
| 23 | 1443420649734 |
| 24 | 5641088964709 |
| 25 | 22068939198169 |