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 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | -3 |
| 9 | 1 |
| 10 | -19 |
| 11 | 0 |
| 12 | 4 |
| 13 | -4 |
| 14 | 1 |
| 15 | 9 |
| 16 | 0 |
| 17 | -15 |
| 18 | 55 |
| 19 | -15 |
| 20 | 1 |
| 21 | -863 |
| 22 | 0 |
| 23 | 72 |
| 24 | -100 |
| 25 | 105 |
| 26 | -12 |
| 27 | 1 |
| 28 | 1375 |
| 29 | 0 |
| 30 | -420 |
| 31 | 1918 |
| 32 | -1575 |
| 33 | 119 |
| 34 | -35 |
| 35 | 1 |
| 36 | -33953 |
| 37 | 0 |
| 38 | 2880 |
| 39 | -4704 |
| 40 | 3248 |
| 41 | -1176 |
| 42 | 700 |
| 43 | -24 |
| 44 | 1 |
| 45 | 57281 |
| 46 | 0 |
| 47 | -22680 |
| 48 | 39204 |
| 49 | -29547 |
| 50 | 60921 |
| 51 | -2940 |
| 52 | 414 |
| 53 | -63 |
| 54 | 1 |
| 55 | -3250433 |
| 56 | 0 |
| 57 | 201600 |
| 58 | -365280 |
| 59 | 295310 |
| 60 | -134568 |
| 61 | 37415 |
| 62 | -6480 |
| 63 | 1365 |
| 64 | -40 |
| 65 | 1 |