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 | 5 |
| 4 | 13 |
| 5 | 60 |
| 6 | 246 |
| 7 | 1266 |
| 8 | 6679 |
| 9 | 39568 |
| 10 | 247940 |
| 11 | 1677435 |
| 12 | 12020295 |
| 13 | 91463410 |
| 14 | 733490265 |
| 15 | 6189608760 |
| 16 | 54746987035 |
| 17 | 506444804075 |
| 18 | 4887127598817 |
| 19 | 49096724251235 |
| 20 | 512474550910080 |
| 21 | 5548429401985372 |
| 22 | 62208756548406172 |
| 23 | 721256031012180537 |
| 24 | 8635815672831322186 |