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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 15 |
| 6 | 55 |
| 7 | 248 |
| 8 | 1256 |
| 9 | 6844 |
| 10 | 38930 |
| 11 | 226961 |
| 12 | 1345641 |
| 13 | 8072770 |
| 14 | 48882245 |
| 15 | 298237393 |