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 | -4 |
| 2 | -2 |
| 3 | 16 |
| 4 | 9 |
| 5 | 4 |
| 6 | -90 |
| 7 | -56 |
| 8 | 12 |
| 9 | 60 |
| 10 | 700 |
| 11 | 232 |
| 12 | -51 |
| 13 | -1128 |
| 14 | -2006 |
| 15 | -3648 |
| 16 | -2999 |
| 17 | 6292 |
| 18 | 12004 |
| 19 | 19192 |
| 20 | 8829 |
| 21 | 35024 |
| 22 | -43368 |
| 23 | -92480 |
| 24 | -113859 |
| 25 | -227356 |
| 26 | -33906 |
| 27 | 55072 |
| 28 | 569221 |
| 29 | 631620 |
| 30 | 1193412 |
| 31 | 1593152 |
| 32 | 1178350 |
| 33 | -2589588 |
| 34 | -4131366 |
| 35 | -6312376 |
| 36 | -12864282 |
| 37 | -6891608 |
| 38 | -10022026 |
| 39 | 10270984 |