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 | -17 |
| 2 | 131 |
| 3 | -442 |
| 4 | 24853 |
| 5 | -11050 |
| 6 | 612491 |
| 7 | -300118 |
| 8 | 25183573 |
| 9 | 970190 |
| 10 | -4932076745 |
| 11 | -1524611374 |
| 12 | 61514838247663 |
| 13 | 453106175990 |
| 14 | -50137550265523 |
| 15 | -196144583427910 |
| 16 | 2099358584443935221 |
| 17 | 109447606273742750 |
| 18 | -2062360122343151678743 |
| 19 | -76800667149793429726 |