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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 8 |
| 7 | 41 |
| 8 | 171 |
| 9 | 633 |
| 10 | 2171 |
| 11 | 7070 |
| 12 | 22195 |
| 13 | 67830 |
| 14 | 203130 |
| 15 | 598806 |
| 16 | 1743258 |
| 17 | 5023711 |
| 18 | 14356226 |
| 19 | 40737383 |
| 20 | 114904941 |
| 21 | 322432215 |
| 22 | 900707165 |
| 23 | 2506181060 |
| 24 | 6948996085 |
| 25 | 19207795836 |
| 26 | 52944197508 |
| 27 | 145567226556 |
| 28 | 399314965956 |
| 29 | 1093107693133 |
| 30 | 2986640695436 |