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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 19 |
| 7 | 61 |
| 8 | 200 |
| 9 | 670 |
| 10 | 2286 |
| 11 | 7918 |
| 12 | 27770 |
| 13 | 98424 |
| 14 | 351983 |
| 15 | 1268541 |
| 16 | 4602752 |
| 17 | 16799894 |
| 18 | 61642078 |
| 19 | 227239086 |
| 20 | 841230292 |
| 21 | 3126039364 |
| 22 | 11656497518 |
| 23 | 43601626146 |
| 24 | 163561902392 |
| 25 | 615183356156 |
| 26 | 2319423532024 |
| 27 | 8764535189296 |
| 28 | 33187922345210 |
| 29 | 125912855167740 |