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 | 0 |
| 2 | 1 |
| 3 | -3 |
| 4 | 4 |
| 5 | -3 |
| 6 | 5 |
| 7 | -12 |
| 8 | 14 |
| 9 | -10 |
| 10 | 18 |
| 11 | -37 |
| 12 | 41 |
| 13 | -34 |
| 14 | 54 |
| 15 | -98 |
| 16 | 109 |
| 17 | -92 |
| 18 | 138 |
| 19 | -237 |
| 20 | 260 |
| 21 | -230 |
| 22 | 329 |
| 23 | -531 |
| 24 | 583 |
| 25 | -526 |
| 26 | 728 |
| 27 | -1129 |
| 28 | 1233 |
| 29 | -1143 |
| 30 | 1537 |
| 31 | -2292 |
| 32 | 2503 |
| 33 | -2355 |
| 34 | 3097 |
| 35 | -4486 |
| 36 | 4889 |
| 37 | -4677 |
| 38 | 6031 |
| 39 | -8502 |
| 40 | 9263 |
| 41 | -8962 |
| 42 | 11372 |
| 43 | -15680 |
| 44 | 17066 |
| 45 | -16703 |
| 46 | 20893 |