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 | 55 |
| 3 | 1891 |
| 4 | 64261 |
| 5 | 2183005 |
| 6 | 74157931 |
| 7 | 2519186671 |
| 8 | 85578188905 |
| 9 | 2907139236121 |
| 10 | 98757155839231 |
| 11 | 3354836159297755 |
| 12 | 113965672260284461 |
| 13 | 3871478020690373941 |
| 14 | 131516287031212429555 |
| 15 | 4467682281040532230951 |
| 16 | 151769681268346883422801 |