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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | -3 |
| 5 | 6 |
| 6 | -9 |
| 7 | 15 |
| 8 | -24 |
| 9 | 29 |
| 10 | -30 |
| 11 | 45 |
| 12 | -67 |
| 13 | 66 |
| 14 | -63 |
| 15 | 98 |
| 16 | -129 |
| 17 | 120 |
| 18 | -117 |
| 19 | 153 |
| 20 | -204 |
| 21 | 206 |
| 22 | -165 |
| 23 | 231 |
| 24 | -341 |
| 25 | 282 |
| 26 | -234 |
| 27 | 354 |
| 28 | -417 |
| 29 | 378 |
| 30 | -354 |
| 31 | 435 |
| 32 | -594 |
| 33 | 542 |
| 34 | -408 |
| 35 | 582 |
| 36 | -770 |
| 37 | 630 |
| 38 | -513 |
| 39 | 770 |
| 40 | -966 |
| 41 | 780 |
| 42 | -702 |
| 43 | 861 |
| 44 | -1071 |
| 45 | 1072 |
| 46 | -759 |
| 47 | 1035 |
| 48 | -1527 |
| 49 | 1143 |
| 50 | -930 |
| 51 | 1346 |