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 | 25 |
| 3 | 223 |
| 4 | 3 |
| 5 | 3585 |
| 6 | 14847 |
| 7 | 30458 |
| 8 | 8053063679 |
| 9 | 7 |
| 10 | 128849018881 |
| 11 | 31588351 |
| 12 | 134140418588671 |
| 13 | 32178205 |
| 14 | 129990652 |
| 15 | 1318594171818636545920576603798101819391 |
| 16 | 15 |