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 | 4 |
| 4 | 32 |
| 5 | 402 |
| 6 | 7038 |
| 7 | 160114 |
| 8 | 4522578 |
| 9 | 153640590 |
| 10 | 6132546770 |
| 11 | 282517271694 |
| 12 | 14812447505646 |
| 13 | 873934551644074 |
| 14 | 57486823088667270 |
| 15 | 4183353479821220130 |
| 16 | 334572221351085006242 |
| 17 | 29242220614539638127294 |
| 18 | 2779426070382982579163202 |
| 19 | 286058737295150226682469518 |