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 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 79 |
| 6 | 345 |
| 7 | 2785 |
| 8 | 19595 |
| 9 | 171141 |
| 10 | 1555181 |
| 11 | 18998391 |
| 12 | 184988197 |
| 13 | 2675065491 |
| 14 | 35582840563 |
| 15 | 490186693669 |