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 | 8 |
| 3 | 23 |
| 4 | 53 |
| 5 | 138 |
| 6 | 312 |
| 7 | 807 |
| 8 | 1821 |
| 9 | 4706 |
| 10 | 10616 |
| 11 | 27431 |
| 12 | 61877 |
| 13 | 159882 |
| 14 | 360648 |
| 15 | 931863 |
| 16 | 2102013 |
| 17 | 5431298 |
| 18 | 12251432 |
| 19 | 31655927 |
| 20 | 71406581 |
| 21 | 184504266 |
| 22 | 416188056 |
| 23 | 1075369671 |
| 24 | 2425721757 |
| 25 | 6267713762 |
| 26 | 14138142488 |
| 27 | 36530912903 |
| 28 | 82403133173 |
| 29 | 212917763658 |
| 30 | 480280656552 |