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 | 1 |
| 3 | -2 |
| 4 | 1 |
| 5 | -2 |
| 6 | 3 |
| 7 | -3 |
| 8 | 4 |
| 9 | -5 |
| 10 | 6 |
| 11 | -7 |
| 12 | 8 |
| 13 | -9 |
| 14 | 11 |
| 15 | -13 |
| 16 | 16 |
| 17 | -18 |
| 18 | 21 |
| 19 | -24 |
| 20 | 27 |
| 21 | -32 |
| 22 | 36 |
| 23 | -41 |
| 24 | 48 |
| 25 | -54 |
| 26 | 61 |
| 27 | -70 |
| 28 | 78 |
| 29 | -88 |
| 30 | 100 |
| 31 | -112 |
| 32 | 127 |
| 33 | -143 |
| 34 | 159 |
| 35 | -179 |
| 36 | 199 |
| 37 | -222 |
| 38 | 248 |
| 39 | -276 |
| 40 | 308 |
| 41 | -342 |
| 42 | 380 |
| 43 | -421 |
| 44 | 465 |
| 45 | -516 |
| 46 | 570 |
| 47 | -629 |
| 48 | 697 |
| 49 | -767 |
| 50 | 845 |
| 51 | -932 |
| 52 | 1022 |
| 53 | -1124 |
| 54 | 1236 |
| 55 | -1355 |
| 56 | 1488 |
| 57 | -1631 |
| 58 | 1785 |
| 59 | -1954 |
| 60 | 2136 |