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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 41 |
| 6 | 130 |
| 7 | 414 |
| 8 | 1365 |
| 9 | 4564 |
| 10 | 15491 |
| 11 | 53147 |
| 12 | 184014 |
| 13 | 641710 |
| 14 | 2251113 |
| 15 | 7937416 |
| 16 | 28108741 |
| 17 | 99903584 |
| 18 | 356181450 |
| 19 | 1273253851 |
| 20 | 4561936460 |
| 21 | 16377201916 |
| 22 | 58894487282 |
| 23 | 212108951615 |
| 24 | 764910126587 |
| 25 | 2761577715513 |
| 26 | 9980164366260 |
| 27 | 36099265669505 |
| 28 | 130675238973018 |