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 | -99 |
| 2 | -99 |
| 3 | 1960101 |
| 4 | 7840701 |
| 5 | -155226277899 |
| 6 | -1319555674899 |
| 7 | 26121225430931301 |
| 8 | 381134689417943901 |
| 9 | -7543761920163143670699 |
| 10 | -168204228721945992219699 |
| 11 | 3328727258163288077733522501 |