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 | -2 |
| 4 | 0 |
| 5 | -1 |
| 6 | 2 |
| 7 | -1 |
| 8 | 3 |
| 9 | -3 |
| 10 | 4 |
| 11 | -6 |
| 12 | 7 |
| 13 | -10 |
| 14 | 13 |
| 15 | -17 |
| 16 | 23 |
| 17 | -30 |
| 18 | 40 |
| 19 | -53 |
| 20 | 70 |
| 21 | -93 |
| 22 | 123 |
| 23 | -163 |
| 24 | 216 |
| 25 | -286 |
| 26 | 379 |
| 27 | -502 |
| 28 | 665 |
| 29 | -881 |
| 30 | 1167 |
| 31 | -1546 |
| 32 | 2048 |
| 33 | -2713 |
| 34 | 3594 |
| 35 | -4761 |
| 36 | 6307 |
| 37 | -8355 |
| 38 | 11068 |
| 39 | -14662 |
| 40 | 19423 |
| 41 | -25730 |
| 42 | 34085 |
| 43 | -45153 |
| 44 | 59815 |
| 45 | -79238 |
| 46 | 104968 |
| 47 | -139053 |
| 48 | 184206 |
| 49 | -244021 |
| 50 | 323259 |
| 51 | -428227 |
| 52 | 567280 |