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 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 11 |
| 7 | 61 |
| 8 | 499 |
| 9 | 5500 |
| 10 | 75635 |
| 11 | 1237670 |
| 12 | 23352425 |
| 13 | 498028767 |
| 14 | 11836515526 |
| 15 | 310152665647 |
| 16 | 8883427573134 |