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 | 4 |
| 3 | 34 |
| 4 | 412 |
| 5 | 6333 |
| 6 | 116768 |
| 7 | 2498414 |
| 8 | 60678776 |
| 9 | 1646370324 |
| 10 | 49304407416 |
| 11 | 1614242231610 |
| 12 | 57334041759484 |
| 13 | 2194946060935833 |
| 14 | 90082535627196868 |
| 15 | 3944898781246389318 |
| 16 | 183589807833908851744 |
| 17 | 9047581726126772883962 |
| 18 | 470671514968767824048292 |