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 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | -4 |
| 4 | 0 |
| 5 | 5 |
| 6 | -1 |
| 7 | -8 |
| 8 | 0 |
| 9 | 9 |
| 10 | -1 |
| 11 | -12 |
| 12 | -24 |
| 13 | -11 |
| 14 | 3 |
| 15 | 18 |
| 16 | 2 |
| 17 | -15 |
| 18 | -33 |
| 19 | -52 |
| 20 | -32 |
| 21 | -11 |
| 22 | -33 |
| 23 | -56 |
| 24 | -80 |
| 25 | -105 |
| 26 | -131 |
| 27 | -104 |
| 28 | -132 |
| 29 | -103 |
| 30 | -133 |
| 31 | -164 |
| 32 | -196 |
| 33 | -229 |
| 34 | -263 |
| 35 | -228 |
| 36 | -192 |
| 37 | -155 |
| 38 | -193 |
| 39 | -154 |
| 40 | -194 |
| 41 | -235 |
| 42 | -277 |
| 43 | -320 |
| 44 | -364 |
| 45 | -319 |
| 46 | -273 |
| 47 | -320 |
| 48 | -368 |
| 49 | -319 |
| 50 | -369 |
| 51 | -318 |
| 52 | -370 |
| 53 | -423 |
| 54 | -477 |
| 55 | -532 |