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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 26 |
| 8 | 96 |
| 9 | 414 |
| 10 | 2040 |
| 11 | 11432 |
| 12 | 72022 |
| 13 | 503973 |
| 14 | 3875329 |
| 15 | 32429747 |
| 16 | 292872455 |
| 17 | 2834089224 |
| 18 | 29209213572 |
| 19 | 318979706486 |