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 | 2 |
| 1 | 1 |
| 2 | -2 |
| 3 | 5 |
| 4 | -9 |
| 5 | 14 |
| 6 | -20 |
| 7 | 27 |
| 8 | -35 |
| 9 | 44 |
| 10 | -54 |
| 11 | 65 |
| 12 | -77 |
| 13 | 90 |
| 14 | -104 |
| 15 | 119 |
| 16 | -135 |
| 17 | 152 |
| 18 | -170 |
| 19 | 189 |
| 20 | -209 |
| 21 | 230 |
| 22 | -252 |
| 23 | 275 |
| 24 | -299 |
| 25 | 324 |
| 26 | -350 |
| 27 | 377 |
| 28 | -405 |
| 29 | 434 |
| 30 | -464 |
| 31 | 495 |
| 32 | -527 |
| 33 | 560 |
| 34 | -594 |
| 35 | 629 |
| 36 | -665 |
| 37 | 702 |
| 38 | -740 |
| 39 | 779 |
| 40 | -819 |
| 41 | 860 |
| 42 | -902 |
| 43 | 945 |
| 44 | -989 |
| 45 | 1034 |
| 46 | -1080 |
| 47 | 1127 |
| 48 | -1175 |
| 49 | 1224 |
| 50 | -1274 |
| 51 | 1325 |
| 52 | -1377 |
| 53 | 1430 |
| 54 | -1484 |
| 55 | 1539 |
| 56 | -1595 |
| 57 | 1652 |
| 58 | -1710 |
| 59 | 1769 |
| 60 | -1829 |
| 61 | 1890 |
| 62 | -1952 |
| 63 | 2015 |