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) |
|---|---|
| 1 | -2 |
| 2 | -3 |
| 3 | 5 |
| 4 | -7 |
| 5 | -11 |
| 6 | -13 |
| 7 | 31 |
| 8 | -17 |
| 9 | -19 |
| 10 | -23 |
| 11 | 59 |
| 12 | -29 |
| 13 | -37 |
| 14 | -41 |
| 15 | 107 |
| 16 | -43 |
| 17 | -47 |
| 18 | -53 |
| 19 | -61 |
| 20 | -67 |
| 21 | 271 |
| 22 | -71 |
| 23 | -73 |
| 24 | -79 |
| 25 | 223 |
| 26 | -83 |
| 27 | -89 |
| 28 | -97 |
| 29 | 269 |
| 30 | -101 |
| 31 | -103 |
| 32 | -109 |
| 33 | 313 |
| 34 | -113 |
| 35 | -127 |
| 36 | -131 |
| 37 | -137 |
| 38 | -139 |
| 39 | 647 |
| 40 | -149 |
| 41 | -151 |
| 42 | -157 |
| 43 | 457 |
| 44 | -163 |
| 45 | -167 |
| 46 | -173 |
| 47 | 503 |
| 48 | -179 |
| 49 | -181 |
| 50 | -191 |
| 51 | -193 |
| 52 | -197 |
| 53 | 941 |