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 | 7 |
| 4 | 62 |
| 5 | 402 |
| 6 | 1960 |
| 7 | 7587 |
| 8 | 25470 |
| 9 | 73146 |
| 10 | 193036 |
| 11 | 455161 |
| 12 | 1022770 |
| 13 | 2098782 |
| 14 | 4196208 |
| 15 | 7797217 |
| 16 | 14286908 |
| 17 | 24527232 |
| 18 | 42125055 |
| 19 | 67955391 |
| 20 | 110571248 |
| 21 | 170260213 |
| 22 | 264585538 |
| 23 | 390623343 |
| 24 | 588725404 |
| 25 | 837466268 |
| 26 | 1220597598 |
| 27 | 1696535256 |