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 | -45 |
| 2 | 2145 |
| 3 | -120219 |
| 4 | 7919340 |
| 5 | -606628022 |
| 6 | 53474070910 |
| 7 | -5374713460730 |
| 8 | 611010175914787 |
| 9 | -78004425857806195 |
| 10 | 11112322069667692951 |
| 11 | -1756425255264484313405 |
| 12 | 306452433822808726723270 |
| 13 | -58746833330940131294327300 |
| 14 | 12321258284843928550078672460 |