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 | -24 |
| 3 | 852 |
| 4 | -35744 |
| 5 | 1645794 |
| 6 | -80415216 |
| 7 | 4094489992 |
| 8 | -214888573248 |
| 9 | 11542515402255 |
| 10 | -631467591949480 |
| 11 | 35063515239394764 |
| 12 | -1971043639046131296 |
| 13 | 111949770626330347638 |
| 14 | -6414671157989386260432 |
| 15 | 370360217892318010055832 |
| 16 | -21525284426246779936288192 |