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 | -8 |
| 8 | -2 |
| 9 | -2 |
| 10 | 1 |
| 11 | -23 |
| 12 | 43 |
| 13 | 19 |
| 14 | 19 |
| 15 | 1 |
| 16 | -49 |
| 17 | 301 |
| 18 | -199 |
| 19 | -79 |
| 20 | -79 |
| 21 | 1 |
| 22 | -89 |
| 23 | 1186 |
| 24 | -3314 |
| 25 | 796 |
| 26 | 76 |
| 27 | 76 |
| 28 | 1 |
| 29 | -146 |
| 30 | 3529 |
| 31 | -22196 |
| 32 | 34644 |
| 33 | -2400 |
| 34 | 2640 |
| 35 | 2640 |
| 36 | 1 |
| 37 | -223 |
| 38 | 8793 |
| 39 | -100967 |
| 40 | 372863 |
| 41 | -362529 |
| 42 | 3375 |
| 43 | -36945 |
| 44 | -36945 |
| 45 | 1 |
| 46 | -323 |
| 47 | 19333 |
| 48 | -361691 |
| 49 | 2466883 |
| 50 | -6010901 |
| 51 | 3911515 |
| 52 | -33509 |
| 53 | 329371 |
| 54 | 329371 |