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 | 0 |
| 2 | -3 |
| 3 | -15 |
| 4 | 406 |
| 5 | 14355 |
| 6 | -189123 |
| 7 | -42283696 |
| 8 | -837846615 |
| 9 | 284972761557 |
| 10 | 28521503291230 |
| 11 | -3070544172379761 |
| 12 | -1054107683427761463 |
| 13 | 1143265731049052000 |
| 14 | 54900209444888714822181 |
| 15 | 7959249060310612253252265 |
| 16 | -3679623847504649619798598778 |
| 17 | -1631286181830482909037469295781 |