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 | 2 |
| 2 | 18 |
| 3 | 82 |
| 4 | 338 |
| 5 | 850 |
| 6 | 1874 |
| 7 | 5970 |
| 8 | 22354 |
| 9 | 55122 |
| 10 | 120658 |
| 11 | 382802 |
| 12 | 1431378 |
| 13 | 3528530 |
| 14 | 7722834 |
| 15 | 24500050 |
| 16 | 58054482 |
| 17 | 125163346 |
| 18 | 259381074 |
| 19 | 527816530 |
| 20 | 1601558354 |
| 21 | 5896525650 |
| 22 | 14486460242 |
| 23 | 31666329426 |
| 24 | 66026067794 |
| 25 | 134745544530 |
| 26 | 409623451474 |
| 27 | 959379265362 |
| 28 | 2058890893138 |