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 | -1 |
| 2 | -35 |
| 3 | 107 |
| 4 | 6265 |
| 5 | -32041 |
| 6 | -2749355 |
| 7 | 19696067 |
| 8 | 2247032305 |
| 9 | -20698163281 |
| 10 | -2950725914675 |
| 11 | 33220406931227 |
| 12 | 5682862415856745 |
| 13 | -75612617322835321 |
| 14 | -15090424387627057595 |
| 15 | 231673592430307689587 |
| 16 | 52841539466887256047585 |
| 17 | -919407851749260210944161 |