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 | 6 |
| 3 | 42 |
| 4 | 143100 |
| 5 | 775304 |
| 6 | 1891890 |
| 7 | 14646554832 |
| 8 | 130985694070 |
| 9 | 188757015148 |
| 10 | 419047914740 |
| 11 | 1055777525624570390 |
| 12 | 1492138298614167680 |
| 13 | 70288308055831268412 |
| 14 | 91779857115464381780 |
| 15 | 571686203669195590338 |
| 16 | 56978071532766214007450 |
| 17 | 83023388015844408083484 |