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 | -2 |
| 2 | 6 |
| 3 | -10 |
| 4 | 14 |
| 5 | -18 |
| 6 | 22 |
| 7 | -26 |
| 8 | 30 |
| 9 | -34 |
| 10 | 38 |
| 11 | -42 |
| 12 | 46 |
| 13 | -50 |
| 14 | 54 |
| 15 | -58 |
| 16 | 62 |
| 17 | -66 |
| 18 | 70 |
| 19 | -74 |
| 20 | 78 |
| 21 | -82 |
| 22 | 86 |
| 23 | -90 |
| 24 | 94 |
| 25 | -98 |
| 26 | 102 |
| 27 | -106 |
| 28 | 110 |
| 29 | -114 |
| 30 | 118 |
| 31 | -122 |
| 32 | 126 |
| 33 | -130 |
| 34 | 134 |
| 35 | -138 |
| 36 | 142 |
| 37 | -146 |
| 38 | 150 |
| 39 | -154 |
| 40 | 158 |
| 41 | -162 |
| 42 | 166 |
| 43 | -170 |
| 44 | 174 |
| 45 | -178 |
| 46 | 182 |
| 47 | -186 |
| 48 | 190 |
| 49 | -194 |
| 50 | 198 |
| 51 | -202 |
| 52 | 206 |
| 53 | -210 |
| 54 | 214 |
| 55 | -218 |
| 56 | 222 |
| 57 | -226 |
| 58 | 230 |
| 59 | -234 |