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 | 2 |
| 2 | -1454 |
| 3 | -8740 |
| 4 | 6342316 |
| 5 | 63656312 |
| 6 | -46108171016 |
| 7 | -649081759408 |
| 8 | 469281829870480 |
| 9 | 8509453301475872 |
| 10 | -6140897264957486816 |
| 11 | -136349623665433187392 |
| 12 | 98215011088057307180224 |
| 13 | 2582003037826533660970880 |
| 14 | -1856403314087385132972023936 |