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 | 1 |
| 2 | 1 |
| 3 | -2 |
| 4 | 13 |
| 5 | -9 |
| 6 | 28 |
| 7 | -20 |
| 8 | 109 |
| 9 | -11 |
| 10 | 151 |
| 11 | -54 |
| 12 | 256 |
| 13 | -77 |
| 14 | 442 |
| 15 | 48 |
| 16 | 877 |
| 17 | -135 |
| 18 | 757 |
| 19 | -170 |
| 20 | 1363 |
| 21 | 103 |
| 22 | 1816 |
| 23 | -252 |
| 24 | 2080 |
| 25 | -59 |
| 26 | 3043 |
| 27 | -38 |
| 28 | 3982 |
| 29 | -405 |
| 30 | 2878 |
| 31 | -464 |
| 32 | 7021 |
| 33 | 273 |
| 34 | 6937 |
| 35 | 390 |
| 36 | 6817 |
| 37 | -665 |
| 38 | 9748 |
| 39 | 388 |
| 40 | 11059 |
| 41 | -819 |
| 42 | 8407 |
| 43 | -902 |
| 44 | 16348 |
| 45 | 219 |
| 46 | 17458 |
| 47 | -1080 |
| 48 | 16672 |
| 49 | -167 |