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 | -3 |
| 2 | 4 |
| 3 | 25 |
| 4 | -56 |
| 5 | 32 |
| 6 | -427 |
| 7 | 1228 |
| 8 | -1184 |
| 9 | 384 |
| 10 | 12465 |
| 11 | -41840 |
| 12 | 52416 |
| 13 | -29184 |
| 14 | 6144 |
| 15 | -555731 |
| 16 | 2079892 |
| 17 | -3076288 |
| 18 | 2258688 |
| 19 | -829440 |
| 20 | 122880 |
| 21 | 35135945 |
| 22 | -142843304 |
| 23 | 237829600 |
| 24 | -208562688 |
| 25 | 102279168 |
| 26 | -26787840 |
| 27 | 2949120 |
| 28 | -2990414715 |
| 29 | 12987478876 |
| 30 | -23672564832 |
| 31 | 23581133952 |
| 32 | -13947525120 |
| 33 | 4929576960 |
| 34 | -970260480 |