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) |
|---|---|
| 3 | 839 |
| 4 | 48451 |
| 5 | 1277794 |
| 6 | 20499983 |
| 7 | 217367668 |
| 8 | 1310255037 |
| 9 | -3988076346 |
| 10 | -248575701031 |
| 11 | -4423141531241 |
| 12 | -58198384719342 |
| 13 | -649357370614484 |
| 14 | -6449481786729030 |
| 15 | -58156975255481312 |