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 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 3 |
| 9 | -4 |
| 10 | 4 |
| 11 | -5 |
| 12 | 5 |
| 13 | -5 |
| 14 | 7 |
| 15 | -7 |
| 16 | 8 |
| 17 | -10 |
| 18 | 9 |
| 19 | -10 |
| 20 | 11 |
| 21 | -11 |
| 22 | 14 |
| 23 | -15 |
| 24 | 16 |
| 25 | -18 |
| 26 | 17 |
| 27 | -18 |
| 28 | 20 |
| 29 | -21 |
| 30 | 24 |
| 31 | -26 |
| 32 | 27 |
| 33 | -29 |
| 34 | 29 |
| 35 | -31 |
| 36 | 35 |
| 37 | -36 |
| 38 | 40 |
| 39 | -43 |
| 40 | 43 |
| 41 | -46 |
| 42 | 48 |
| 43 | -51 |
| 44 | 56 |
| 45 | -59 |
| 46 | 63 |
| 47 | -67 |
| 48 | 68 |
| 49 | -72 |
| 50 | 77 |
| 51 | -80 |
| 52 | 86 |
| 53 | -91 |
| 54 | 94 |
| 55 | -99 |
| 56 | 103 |
| 57 | -108 |
| 58 | 116 |
| 59 | -121 |
| 60 | 127 |
| 61 | -134 |
| 62 | 137 |
| 63 | -143 |
| 64 | 151 |