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 | 2 |
| 3 | -3 |
| 4 | 4 |
| 5 | -6 |
| 6 | 9 |
| 7 | -12 |
| 8 | 16 |
| 9 | -22 |
| 10 | 29 |
| 11 | -38 |
| 12 | 50 |
| 13 | -64 |
| 14 | 82 |
| 15 | -105 |
| 16 | 132 |
| 17 | -166 |
| 18 | 208 |
| 19 | -258 |
| 20 | 320 |
| 21 | -395 |
| 22 | 484 |
| 23 | -592 |
| 24 | 722 |
| 25 | -876 |
| 26 | 1060 |
| 27 | -1280 |
| 28 | 1539 |
| 29 | -1846 |
| 30 | 2210 |
| 31 | -2636 |
| 32 | 3138 |
| 33 | -3728 |
| 34 | 4416 |
| 35 | -5222 |
| 36 | 6163 |
| 37 | -7256 |
| 38 | 8528 |
| 39 | -10006 |
| 40 | 11716 |
| 41 | -13696 |
| 42 | 15986 |
| 43 | -18624 |
| 44 | 21666 |
| 45 | -25169 |
| 46 | 29190 |
| 47 | -33808 |
| 48 | 39104 |