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 | -4 |
| 5 | 1 |
| 6 | -5 |
| 7 | 13 |
| 8 | -7 |
| 9 | 1 |
| 10 | 13 |
| 11 | -40 |
| 12 | 33 |
| 13 | -10 |
| 14 | 1 |
| 15 | -34 |
| 16 | 120 |
| 17 | -132 |
| 18 | 62 |
| 19 | -13 |
| 20 | 1 |
| 21 | 89 |
| 22 | -354 |
| 23 | 483 |
| 24 | -308 |
| 25 | 100 |
| 26 | -16 |
| 27 | 1 |
| 28 | -233 |
| 29 | 1031 |
| 30 | -1671 |
| 31 | 1345 |
| 32 | -595 |
| 33 | 147 |
| 34 | -19 |
| 35 | 1 |
| 36 | 610 |
| 37 | -2972 |
| 38 | 5561 |
| 39 | -5398 |
| 40 | 3030 |
| 41 | -1020 |
| 42 | 203 |
| 43 | -22 |
| 44 | 1 |
| 45 | -1597 |
| 46 | 8495 |
| 47 | -17984 |
| 48 | 20410 |
| 49 | -13893 |
| 50 | 5943 |
| 51 | -1610 |
| 52 | 268 |
| 53 | -25 |
| 54 | 1 |
| 55 | 4181 |
| 56 | -24110 |
| 57 | 56886 |
| 58 | -73816 |
| 59 | 59059 |
| 60 | -30702 |
| 61 | 10570 |
| 62 | -2392 |
| 63 | 342 |
| 64 | -28 |
| 65 | 1 |