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 | 7 |
| 2 | 49 |
| 3 | 241 |
| 4 | 1393 |
| 5 | 7915 |
| 6 | 44065 |
| 7 | 248525 |
| 8 | 1398065 |
| 9 | 7855615 |
| 10 | 44186849 |
| 11 | 248469913 |
| 12 | 1397116033 |
| 13 | 7856468163 |
| 14 | 44178243889 |
| 15 | 248421665301 |
| 16 | 1396925252001 |
| 17 | 7855169243255 |
| 18 | 44171085215953 |
| 19 | 248382373987585 |
| 20 | 1396700728871121 |