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 | -23 |
| 3 | 229 |
| 4 | -1243 |
| 5 | 3587 |
| 6 | -2461 |
| 7 | -19205 |
| 8 | 65275 |
| 9 | -48368 |
| 10 | -164288 |
| 11 | 370324 |
| 12 | -620 |
| 13 | -578358 |
| 14 | -176502 |
| 15 | 1040658 |
| 16 | 2027794 |
| 17 | -4878140 |
| 18 | -2150708 |
| 19 | 8510712 |
| 20 | 1400952 |
| 21 | -2818536 |
| 22 | -15649224 |
| 23 | 2994048 |
| 24 | 24283008 |
| 25 | -1216217 |
| 26 | 12649495 |
| 27 | -60629585 |
| 28 | -35982417 |
| 29 | 92424213 |
| 30 | 63212373 |
| 31 | 10369205 |