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 | -2 |
| 3 | -5 |
| 4 | 0 |
| 5 | 4 |
| 6 | 9 |
| 7 | 2 |
| 8 | -10 |
| 9 | -21 |
| 10 | 29 |
| 11 | 15 |
| 12 | -18 |
| 13 | -80 |
| 14 | 50 |
| 15 | 59 |
| 16 | 207 |
| 17 | -228 |
| 18 | -244 |
| 19 | -315 |
| 20 | 868 |
| 21 | 103 |
| 22 | 360 |
| 23 | -1907 |
| 24 | 752 |
| 25 | -151 |
| 26 | 3802 |
| 27 | -5032 |
| 28 | 965 |
| 29 | -5279 |
| 30 | 13742 |
| 31 | -6049 |
| 32 | 9107 |
| 33 | -33835 |
| 34 | 25398 |
| 35 | -15098 |
| 36 | 63365 |
| 37 | -79614 |
| 38 | 51752 |
| 39 | -117194 |
| 40 | 196980 |
| 41 | -156321 |
| 42 | 209085 |
| 43 | -435223 |
| 44 | 463497 |
| 45 | -441950 |
| 46 | 871202 |
| 47 | -1146187 |
| 48 | 1023944 |
| 49 | -1704179 |