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 | 1 |
| 2 | -1 |
| 3 | -4 |
| 4 | -3 |
| 5 | -2 |
| 6 | 7 |
| 7 | 7 |
| 8 | 4 |
| 9 | -6 |
| 10 | 14 |
| 11 | -11 |
| 12 | -4 |
| 13 | -47 |
| 14 | 9 |
| 15 | 6 |
| 16 | 161 |
| 17 | -93 |
| 18 | -33 |
| 19 | -269 |
| 20 | 232 |
| 21 | -83 |
| 22 | 660 |
| 23 | -733 |
| 24 | 500 |
| 25 | -779 |
| 26 | 1527 |
| 27 | -2291 |
| 28 | 1876 |
| 29 | -3892 |
| 30 | 5598 |
| 31 | -3056 |
| 32 | 7791 |
| 33 | -14088 |
| 34 | 11289 |
| 35 | -17113 |
| 36 | 28083 |
| 37 | -26211 |
| 38 | 34645 |
| 39 | -60715 |
| 40 | 73180 |
| 41 | -80951 |
| 42 | 111926 |
| 43 | -155269 |
| 44 | 178561 |
| 45 | -233709 |
| 46 | 359679 |
| 47 | -403884 |
| 48 | 454659 |
| 49 | -697310 |
| 50 | 862133 |