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) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | -5 |
| 4 | -193 |
| 5 | -13397 |
| 6 | -315629 |
| 7 | -282682949 |
| 8 | -71668311457 |
| 9 | -24436072994261 |
| 10 | -829687356768133 |
| 11 | -5984214162917084933 |
| 12 | -4076572731127688098561 |
| 13 | -669050282555409820416913 |
| 14 | -3254803666762108782733299553 |
| 15 | -3704926048371364507765541554757 |
| 16 | -975581171350361622823383714646061 |