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 | 14 |
| 6 | 50 |
| 7 | 191 |
| 8 | 881 |
| 9 | 4494 |
| 10 | 26389 |
| 11 | 184749 |
| 12 | 1728404 |
| 13 | 23805256 |
| 14 | 491544474 |
| 15 | 14491876320 |