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 | 3 |
| 3 | -5 |
| 4 | 6 |
| 5 | -7 |
| 6 | 11 |
| 7 | -16 |
| 8 | 18 |
| 9 | -21 |
| 10 | 30 |
| 11 | -40 |
| 12 | 47 |
| 13 | -56 |
| 14 | 72 |
| 15 | -92 |
| 16 | 108 |
| 17 | -125 |
| 18 | 156 |
| 19 | -193 |
| 20 | 225 |
| 21 | -263 |
| 22 | 318 |
| 23 | -383 |
| 24 | 444 |
| 25 | -513 |
| 26 | 612 |
| 27 | -724 |
| 28 | 834 |
| 29 | -963 |
| 30 | 1129 |
| 31 | -1320 |
| 32 | 1512 |
| 33 | -1730 |
| 34 | 2010 |
| 35 | -2325 |
| 36 | 2652 |
| 37 | -3022 |
| 38 | 3474 |
| 39 | -3988 |
| 40 | 4524 |
| 41 | -5129 |
| 42 | 5857 |
| 43 | -6673 |
| 44 | 7542 |
| 45 | -8515 |
| 46 | 9660 |
| 47 | -10943 |
| 48 | 12312 |
| 49 | -13842 |