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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 1 |
| 6 | 4 |
| 7 | 10 |
| 8 | 20 |
| 9 | 10 |
| 10 | 4 |
| 11 | 1 |
| 12 | 1 |
| 13 | 7 |
| 14 | 27 |
| 15 | 77 |
| 16 | 57 |
| 17 | 0 |
| 18 | -57 |
| 19 | -77 |
| 20 | -27 |
| 21 | -7 |
| 22 | -1 |
| 23 | 1 |
| 24 | 12 |
| 25 | 69 |
| 26 | 272 |
| 27 | 221 |
| 28 | -272 |
| 29 | -1084 |
| 30 | -1688 |
| 31 | -1084 |
| 32 | -272 |
| 33 | 221 |
| 34 | 272 |
| 35 | 69 |
| 36 | 12 |
| 37 | 1 |
| 38 | 1 |
| 39 | 21 |
| 40 | 176 |
| 41 | 936 |
| 42 | 625 |
| 43 | -3288 |
| 44 | -11868 |
| 45 | -21023 |
| 46 | -16223 |
| 47 | 0 |
| 48 | 16223 |
| 49 | 21023 |
| 50 | 11868 |
| 51 | 3288 |
| 52 | -625 |
| 53 | -936 |
| 54 | -176 |
| 55 | -21 |
| 56 | -1 |