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 | 1 |
| 3 | 1 |
| 4 | -7 |
| 5 | 1 |
| 6 | 1 |
| 7 | -51 |
| 8 | -51 |
| 9 | 1 |
| 10 | 1 |
| 11 | -239 |
| 12 | -399 |
| 13 | -239 |
| 14 | 1 |
| 15 | 1 |
| 16 | -967 |
| 17 | -2177 |
| 18 | -2177 |
| 19 | -967 |
| 20 | 1 |
| 21 | 1 |
| 22 | -3639 |
| 23 | -10191 |
| 24 | -13831 |
| 25 | -10191 |
| 26 | -3639 |
| 27 | 1 |
| 28 | 1 |
| 29 | -13115 |
| 30 | -43719 |
| 31 | -74323 |
| 32 | -74323 |
| 33 | -43719 |
| 34 | -13115 |
| 35 | 1 |
| 36 | 1 |
| 37 | -45919 |
| 38 | -177119 |
| 39 | -360799 |
| 40 | -452639 |
| 41 | -360799 |
| 42 | -177119 |
| 43 | -45919 |
| 44 | 1 |