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) |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 127 |
| 3 | 1657 |
| 4 | 2999 |
| 5 | 44351 |
| 6 | 305717 |
| 7 | 1133131 |
| 8 | 370373 |
| 9 | 1357333 |
| 10 | 46006967 |
| 11 | 268119667 |
| 12 | 291057563 |
| 13 | 3429782399 |
| 14 | 10502593369 |
| 15 | 10926444847 |
| 16 | 87241771051 |
| 17 | 226751019863 |
| 18 | 1901687257829 |