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) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 479 |
| 6 | 413 |
| 7 | 63397 |
| 8 | 514639 |
| 9 | 10410343 |
| 10 | 1411432849 |
| 11 | 6620481151 |
| 12 | 6454614084953 |
| 13 | 421950627598601 |
| 14 | 8222379104323 |
| 15 | 3989306589962303 |
| 16 | 443539778381788333 |
| 17 | 148124338024667050948691 |
| 18 | 143366612154851808752629 |