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 | -2 |
| 2 | 0 |
| 3 | -3 |
| 4 | 5 |
| 5 | -3 |
| 6 | 14 |
| 7 | -4 |
| 8 | 25 |
| 9 | -32 |
| 10 | 16 |
| 11 | -88 |
| 12 | 18 |
| 13 | -155 |
| 14 | 108 |
| 15 | -153 |
| 16 | 393 |
| 17 | -88 |
| 18 | 855 |
| 19 | -160 |
| 20 | 1255 |
| 21 | -974 |
| 22 | 1122 |
| 23 | -3172 |
| 24 | 370 |
| 25 | -6794 |
| 26 | 383 |
| 27 | -10017 |
| 28 | 5004 |
| 29 | -9460 |
| 30 | 19380 |
| 31 | -2635 |
| 32 | 45790 |
| 33 | 5008 |
| 34 | 76263 |
| 35 | -7353 |
| 36 | 87597 |
| 37 | -77967 |
| 38 | 48886 |
| 39 | -244397 |
| 40 | -45016 |
| 41 | -500016 |
| 42 | -115318 |
| 43 | -734277 |
| 44 | 56213 |
| 45 | -710603 |
| 46 | 810177 |
| 47 | -161662 |
| 48 | 2432173 |
| 49 | 910752 |
| 50 | 4767086 |