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 | 5 |
| 2 | 10 |
| 3 | 28 |
| 4 | 99 |
| 5 | 326 |
| 6 | 1080 |
| 7 | 3765 |
| 8 | 13282 |
| 9 | 46928 |
| 10 | 166611 |
| 11 | 595402 |
| 12 | 2132856 |
| 13 | 7647821 |
| 14 | 27453594 |
| 15 | 98644580 |
| 16 | 354622219 |
| 17 | 1275200926 |
| 18 | 4586567656 |
| 19 | 16499401997 |
| 20 | 59359672578 |
| 21 | 213570572184 |
| 22 | 768440651027 |
| 23 | 2764982991218 |
| 24 | 9949082534056 |