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 | 9 |
| 2 | -311 |
| 3 | -9855 |
| 4 | 277041 |
| 5 | 17946009 |
| 6 | -381486279 |
| 7 | -45642389679 |
| 8 | 636016842465 |
| 9 | 148858685615529 |
| 10 | -904139249676759 |
| 11 | -591663300859964511 |
| 12 | -1426321263133495791 |
| 13 | 2770347275877071597625 |
| 14 | 32201658639821938929561 |
| 15 | -14913850922254971477399951 |
| 16 | -323570411102447744202418239 |