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 | -5 |
| 2 | -43 |
| 3 | -579 |
| 4 | -44477 |
| 5 | -5326191 |
| 6 | -180306541 |
| 7 | -203331297947 |
| 8 | -58726239094693 |
| 9 | -781618285277957 |
| 10 | -1025587838964854273 |
| 11 | -35763822710356866613 |
| 12 | -330773478104531041960421 |
| 13 | -237504847171108896327033959 |
| 14 | -196526060612842999084524774697 |
| 15 | -20633624138373135772483762873819 |