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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 20 |
| 5 | 60 |
| 6 | 230 |
| 7 | 950 |
| 8 | 4420 |
| 9 | 22230 |
| 10 | 120914 |
| 11 | 702820 |
| 12 | 4343860 |
| 13 | 28393280 |
| 14 | 195492054 |