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 | 0 |
| 4 | 2 |
| 5 | -1 |
| 6 | 3 |
| 7 | -1 |
| 8 | 5 |
| 9 | -2 |
| 10 | 6 |
| 11 | -3 |
| 12 | 10 |
| 13 | -5 |
| 14 | 13 |
| 15 | -7 |
| 16 | 19 |
| 17 | -11 |
| 18 | 25 |
| 19 | -15 |
| 20 | 35 |
| 21 | -22 |
| 22 | 45 |
| 23 | -30 |
| 24 | 62 |
| 25 | -41 |
| 26 | 79 |
| 27 | -55 |
| 28 | 105 |
| 29 | -75 |
| 30 | 134 |
| 31 | -98 |
| 32 | 175 |
| 33 | -130 |
| 34 | 220 |
| 35 | -168 |
| 36 | 284 |
| 37 | -219 |
| 38 | 355 |
| 39 | -280 |
| 40 | 451 |
| 41 | -360 |
| 42 | 561 |
| 43 | -455 |
| 44 | 705 |
| 45 | -578 |
| 46 | 870 |
| 47 | -725 |
| 48 | 1085 |
| 49 | -910 |
| 50 | 1331 |
| 51 | -1132 |
| 52 | 1644 |
| 53 | -1410 |