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 | -3 |
| 5 | 3 |
| 6 | -5 |
| 7 | 7 |
| 8 | -6 |
| 9 | 6 |
| 10 | -10 |
| 11 | 12 |
| 12 | -11 |
| 13 | 13 |
| 14 | -17 |
| 15 | 20 |
| 16 | -21 |
| 17 | 21 |
| 18 | -27 |
| 19 | 34 |
| 20 | -33 |
| 21 | 36 |
| 22 | -46 |
| 23 | 51 |
| 24 | -53 |
| 25 | 58 |
| 26 | -68 |
| 27 | 78 |
| 28 | -82 |
| 29 | 89 |
| 30 | -104 |
| 31 | 118 |
| 32 | -123 |
| 33 | 131 |
| 34 | -154 |
| 35 | 171 |
| 36 | -179 |
| 37 | 197 |
| 38 | -221 |
| 39 | 245 |
| 40 | -262 |
| 41 | 279 |
| 42 | -314 |
| 43 | 349 |
| 44 | -369 |
| 45 | 398 |
| 46 | -446 |
| 47 | 486 |
| 48 | -515 |
| 49 | 557 |
| 50 | -614 |
| 51 | 671 |
| 52 | -715 |
| 53 | 767 |
| 54 | -845 |
| 55 | 920 |
| 56 | -977 |
| 57 | 1046 |
| 58 | -1148 |
| 59 | 1244 |