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 | -2 |
| 5 | 1 |
| 6 | 1 |
| 7 | 7 |
| 8 | 7 |
| 9 | 1 |
| 10 | 1 |
| 11 | -20 |
| 12 | 70 |
| 13 | -20 |
| 14 | 1 |
| 15 | 1 |
| 16 | 61 |
| 17 | 610 |
| 18 | 610 |
| 19 | 61 |
| 20 | 1 |
| 21 | 1 |
| 22 | -182 |
| 23 | 5551 |
| 24 | -15860 |
| 25 | 5551 |
| 26 | -182 |
| 27 | 1 |
| 28 | 1 |
| 29 | 547 |
| 30 | 49777 |
| 31 | 433771 |
| 32 | 433771 |
| 33 | 49777 |
| 34 | 547 |
| 35 | 1 |
| 36 | 1 |
| 37 | -1640 |
| 38 | 448540 |
| 39 | -11662040 |
| 40 | 35569222 |
| 41 | -11662040 |
| 42 | 448540 |
| 43 | -1640 |
| 44 | 1 |
| 45 | 1 |
| 46 | 4921 |
| 47 | 4035220 |
| 48 | 315323620 |