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 | 5 |
| 3 | 9 |
| 4 | 5 |
| 5 | -7 |
| 6 | 5 |
| 7 | 73 |
| 8 | 69 |
| 9 | -295 |
| 10 | -571 |
| 11 | 1321 |
| 12 | 4613 |
| 13 | -4167 |
| 14 | -32635 |
| 15 | -1783 |
| 16 | 211141 |
| 17 | 200601 |
| 18 | -1229243 |
| 19 | -2468375 |
| 20 | 6117509 |
| 21 | 22557305 |
| 22 | -21519611 |
| 23 | -176980023 |
| 24 | -13664955 |
| 25 | 1234115673 |
| 26 | 1250908869 |
| 27 | -7608051031 |
| 28 | -16094268667 |
| 29 | 39424807225 |
| 30 | 153179607429 |
| 31 | -139981878647 |
| 32 | -1243776268859 |