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) |
|---|---|
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 3 |
| 7 | -2 |
| 8 | 1 |
| 9 | -5 |
| 10 | 23 |
| 11 | -25 |
| 12 | 27 |
| 13 | -49 |
| 14 | 74 |
| 15 | -62 |
| 16 | 85 |
| 17 | -132 |
| 18 | 165 |
| 19 | -195 |
| 20 | 229 |
| 21 | -240 |
| 22 | 325 |
| 23 | -374 |
| 24 | 379 |
| 25 | -469 |
| 26 | 553 |
| 27 | -590 |
| 28 | 746 |
| 29 | -805 |
| 30 | 854 |
| 31 | -1000 |
| 32 | 1085 |
| 33 | -1168 |
| 34 | 1284 |
| 35 | -1396 |
| 36 | 1668 |
| 37 | -1767 |
| 38 | 1815 |
| 39 | -2030 |
| 40 | 2297 |
| 41 | -2450 |
| 42 | 2480 |
| 43 | -2849 |
| 44 | 3293 |
| 45 | -3113 |
| 46 | 3278 |
| 47 | -3772 |
| 48 | 4091 |
| 49 | -4230 |
| 50 | 4213 |
| 51 | -4830 |
| 52 | 5607 |
| 53 | -5499 |
| 54 | 5430 |
| 55 | -6018 |
| 56 | 6922 |
| 57 | -6880 |