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 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 0 |
| 7 | 5 |
| 8 | -7 |
| 9 | 1 |
| 10 | -4 |
| 11 | 22 |
| 12 | 23 |
| 13 | -13 |
| 14 | 1 |
| 15 | -64 |
| 16 | 20 |
| 17 | 172 |
| 18 | 29 |
| 19 | -19 |
| 20 | 1 |
| 21 | -240 |
| 22 | -1120 |
| 23 | -496 |
| 24 | 354 |
| 25 | 111 |
| 26 | -29 |
| 27 | 1 |
| 28 | 2656 |
| 29 | 1760 |
| 30 | -4952 |
| 31 | -1816 |
| 32 | 1054 |
| 33 | 239 |
| 34 | -41 |
| 35 | 1 |
| 36 | 15360 |
| 37 | 24800 |
| 38 | -28640 |
| 39 | -29040 |
| 40 | 2384 |
| 41 | 3938 |
| 42 | 203 |
| 43 | -49 |
| 44 | 1 |
| 45 | 88064 |
| 46 | 587136 |
| 47 | 601216 |
| 48 | -63776 |
| 49 | -191224 |
| 50 | -21360 |
| 51 | 6658 |
| 52 | 511 |
| 53 | -65 |
| 54 | 1 |
| 55 | -1714176 |
| 56 | -4244224 |
| 57 | 4907392 |