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 | 1 |
| 7 | 6 |
| 8 | -6 |
| 9 | 1 |
| 10 | -13 |
| 11 | 4 |
| 12 | 21 |
| 13 | -10 |
| 14 | 1 |
| 15 | 49 |
| 16 | -129 |
| 17 | -5 |
| 18 | 55 |
| 19 | -15 |
| 20 | 1 |
| 21 | 31 |
| 22 | 723 |
| 23 | -624 |
| 24 | -85 |
| 25 | 120 |
| 26 | -21 |
| 27 | 1 |
| 28 | -1981 |
| 29 | -386 |
| 30 | 5271 |
| 31 | -2009 |
| 32 | -385 |
| 33 | 231 |
| 34 | -28 |
| 35 | 1 |
| 36 | 14329 |
| 37 | -34320 |
| 38 | -11978 |
| 39 | 25508 |
| 40 | -4809 |
| 41 | -1204 |
| 42 | 406 |
| 43 | -36 |
| 44 | 1 |
| 45 | -2177 |
| 46 | 347913 |
| 47 | -263862 |
| 48 | -112974 |
| 49 | 93429 |
| 50 | -8757 |
| 51 | -3066 |
| 52 | 666 |
| 53 | -45 |
| 54 | 1 |
| 55 | -1138879 |
| 56 | -701387 |
| 57 | 3956751 |
| 58 | -1200270 |
| 59 | -657735 |
| 60 | 278523 |
| 61 | -10983 |
| 62 | -6810 |
| 63 | 1035 |
| 64 | -55 |
| 65 | 1 |