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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -8 |
| 6 | -64 |
| 7 | -600 |
| 8 | -14104 |
| 9 | -1170120 |
| 10 | -248815984 |
| 11 | -115219852880 |
| 12 | -111345726833056 |
| 13 | -220485042541083808 |
| 14 | -885633596688107274496 |
| 15 | -7173767949430448755993856 |
| 16 | -116777715174661360994951467008 |
| 17 | -3812515511649504447203183936705536 |