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 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 35 |
| 6 | 120 |
| 7 | 427 |
| 8 | 1628 |
| 9 | 6090 |
| 10 | 23797 |
| 11 | 90296 |
| 12 | 350726 |
| 13 | 1338076 |
| 14 | 5165957 |
| 15 | 19732508 |