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 | -12 |
| 3 | 73 |
| 4 | 732 |
| 5 | -3721 |
| 6 | -109332 |
| 7 | 3113561 |
| 8 | 30406812 |
| 9 | -278347351 |
| 10 | -13587056052 |
| 11 | 304035474763 |
| 12 | 8904250650492 |
| 13 | -117738154950781 |
| 14 | -8045727017033172 |
| 15 | 982026184893828457 |
| 16 | 9586782871360007772 |
| 17 | -165767101918545512011 |
| 18 | -14564334832981893064692 |