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 | -13 |
| 2 | -27 |
| 3 | 5447 |
| 4 | 21897 |
| 5 | -8550373 |
| 6 | -51521427 |
| 7 | 28491956207 |
| 8 | 228898201617 |
| 9 | -162934942038973 |
| 10 | -1636222143855627 |
| 11 | 1423695084746914967 |
| 12 | 17156395293052656537 |
| 13 | -17642381532358409441173 |
| 14 | -248035037340684934103427 |
| 15 | 294301682652158427497809727 |