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 | -1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 3 |
| 9 | 1 |
| 10 | 1 |
| 11 | -5 |
| 12 | 15 |
| 13 | -5 |
| 14 | 1 |
| 15 | 1 |
| 16 | 11 |
| 17 | 55 |
| 18 | 55 |
| 19 | 11 |
| 20 | 1 |
| 21 | 1 |
| 22 | -21 |
| 23 | 231 |
| 24 | -385 |
| 25 | 231 |
| 26 | -21 |
| 27 | 1 |
| 28 | 1 |
| 29 | 43 |
| 30 | 903 |
| 31 | 3311 |
| 32 | 3311 |
| 33 | 903 |
| 34 | 43 |
| 35 | 1 |
| 36 | 1 |
| 37 | -85 |
| 38 | 3655 |
| 39 | -25585 |
| 40 | 56287 |
| 41 | -25585 |
| 42 | 3655 |
| 43 | -85 |
| 44 | 1 |
| 45 | 1 |
| 46 | 171 |
| 47 | 14535 |
| 48 | 208335 |
| 49 | 875007 |
| 50 | 875007 |
| 51 | 208335 |
| 52 | 14535 |
| 53 | 171 |
| 54 | 1 |
| 55 | 1 |
| 56 | -341 |
| 57 | 58311 |