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 | 5 |
| 3 | 15 |
| 4 | 41 |
| 5 | 107 |
| 6 | 286 |
| 7 | 700 |
| 8 | 1735 |
| 9 | 4162 |
| 10 | 9803 |
| 11 | 22673 |
| 12 | 51822 |
| 13 | 116376 |
| 14 | 258548 |
| 15 | 567197 |
| 16 | 1230763 |
| 17 | 2642958 |
| 18 | 5622616 |
| 19 | 11850537 |
| 20 | 24769248 |
| 21 | 51353095 |
| 22 | 105662389 |
| 23 | 215838649 |
| 24 | 437890022 |
| 25 | 882562763 |
| 26 | 1767741732 |
| 27 | 3519599996 |
| 28 | 6967592060 |
| 29 | 13717874719 |
| 30 | 26865949075 |