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 | 3 |
| 4 | 14 |
| 5 | 85 |
| 6 | 642 |
| 7 | 5782 |
| 8 | 60484 |
| 9 | 720495 |
| 10 | 9627210 |
| 11 | 142583430 |
| 12 | 2318126196 |
| 13 | 41042117558 |
| 14 | 786002475244 |
| 15 | 16189215818220 |
| 16 | 356847596226840 |
| 17 | 8381418010559225 |
| 18 | 208967274455769810 |
| 19 | 5511890008010697306 |