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) |
|---|---|
| 4 | 7 |
| 5 | 414 |
| 6 | 14850 |
| 7 | 446706 |
| 8 | 12641265 |
| 9 | 354665628 |
| 10 | 10134495804 |
| 11 | 299276271252 |
| 12 | 9206327818259 |
| 13 | 296247209694650 |
| 14 | 9990889751320686 |
| 15 | 353320474467334502 |
| 16 | 13098406010068671725 |
| 17 | 508634687713890475320 |
| 18 | 20666091174548150099160 |
| 19 | 877474636354254652191336 |
| 20 | 38883242288915246015258751 |