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 | -2 |
| 2 | 3 |
| 3 | -4 |
| 4 | 5 |
| 5 | -6 |
| 6 | 7 |
| 7 | -8 |
| 8 | 7 |
| 9 | -4 |
| 10 | -1 |
| 11 | 8 |
| 12 | -17 |
| 13 | 28 |
| 14 | -41 |
| 15 | 56 |
| 16 | -70 |
| 17 | 80 |
| 18 | -83 |
| 19 | 76 |
| 20 | -56 |
| 21 | 20 |
| 22 | 35 |
| 23 | -112 |
| 24 | 210 |
| 25 | -324 |
| 26 | 445 |
| 27 | -562 |
| 28 | 658 |
| 29 | -712 |
| 30 | 699 |
| 31 | -590 |
| 32 | 357 |
| 33 | 22 |
| 34 | -558 |
| 35 | 1252 |
| 36 | -2084 |
| 37 | 3008 |
| 38 | -3947 |
| 39 | 4788 |
| 40 | -5383 |
| 41 | 5556 |
| 42 | -5116 |
| 43 | 3864 |
| 44 | -1618 |
| 45 | -1756 |
| 46 | 6307 |
| 47 | -11956 |
| 48 | 18454 |
| 49 | -25348 |
| 50 | 31962 |
| 51 | -37380 |