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 | 7 |
| 4 | 176 |
| 5 | 9 |
| 6 | 133542 |
| 7 | 103 |
| 8 | 91072 |
| 9 | 99527 |
| 10 | 131023748 |
| 11 | 7591 |
| 12 | 300996993816 |
| 13 | 88001 |
| 14 | 1403843964196 |
| 15 | 44094737 |
| 16 | 10686452707072 |
| 17 | 825533 |
| 18 | 368070779365071896502 |
| 19 | 2895701 |
| 20 | 8653175044141052500 |
| 21 | 81659533540907 |
| 22 | 3080940707518158404 |