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 | -23 |
| 3 | 3592 |
| 4 | -419 |
| 5 | 1 |
| 6 | -94 |
| 7 | 169659 |
| 8 | -65838 |
| 9 | 1092873176 |
| 10 | 145023 |
| 11 | 1 |
| 12 | -213 |
| 13 | 1312544 |
| 14 | -723721 |
| 15 | 44648582886 |
| 16 | 9188934683 |
| 17 | 166629520876208 |
| 18 | 2791651635293 |
| 19 | 1 |
| 20 | -475 |
| 21 | 9032603 |
| 22 | -9455070 |
| 23 | 3949512899743 |
| 24 | -97215753021 |
| 25 | 9776785708507683 |
| 26 | -53144327916296 |
| 27 | -134884469547631 |