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 | 509 |
| 2 | 262139 |
| 3 | 10077689 |
| 4 | 387420479 |
| 5 | 68719476719 |
| 6 | 118587876479 |
| 7 | 1207269217769 |
| 8 | 7625597484959 |
| 9 | 10578455953379 |
| 10 | 129961739795039 |
| 11 | 327381934393919 |
| 12 | 1628413597910399 |
| 13 | 1953124999999949 |
| 14 | 5416169448144839 |
| 15 | 10077695999999939 |