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 | 19 |
| 3 | 56 |
| 4 | 198 |
| 5 | 665 |
| 6 | 2213 |
| 7 | 7479 |
| 8 | 25105 |
| 9 | 84326 |
| 10 | 283532 |
| 11 | 952661 |
| 12 | 3201517 |
| 13 | 10759441 |
| 14 | 36157455 |
| 15 | 121511416 |
| 16 | 408352614 |
| 17 | 1372308917 |
| 18 | 4611790689 |
| 19 | 15498404475 |
| 20 | 52083999509 |
| 21 | 175033735054 |
| 22 | 588219141252 |
| 23 | 1976771852673 |
| 24 | 6643148349849 |