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 | 1 |
| 1 | 1 |
| 2 | 1597 |
| 3 | 29681 |
| 4 | 9475901 |
| 5 | 366944287 |
| 6 | 69289288909 |
| 7 | 3710708201969 |
| 8 | 540061286536921 |
| 9 | 34741645659770711 |
| 10 | 4337452956682508609 |
| 11 | 313196612952258199679 |
| 12 | 35457442115448212075033 |
| 13 | 2764079753958605286860951 |
| 14 | 293251198441417290172509377 |
| 15 | 24080184063411167042923575793 |