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 | 1 |
| 1 | 6 |
| 2 | 35 |
| 3 | 210 |
| 4 | 1287 |
| 5 | 8008 |
| 6 | 50388 |
| 7 | 319770 |
| 8 | 2042975 |
| 9 | 13123110 |
| 10 | 84672315 |
| 11 | 548354040 |
| 12 | 3562467300 |
| 13 | 23206929840 |
| 14 | 151532656696 |
| 15 | 991493848554 |
| 16 | 6499270398159 |
| 17 | 42671977361650 |
| 18 | 280576272201225 |