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 | -9 |
| 2 | 18 |
| 3 | 51 |
| 4 | -171 |
| 5 | -117 |
| 6 | 249 |
| 7 | 1251 |
| 8 | 531 |
| 9 | -5599 |
| 10 | -3006 |
| 11 | -2295 |
| 12 | 20664 |
| 13 | 50508 |
| 14 | -6354 |
| 15 | -78597 |
| 16 | -292887 |
| 17 | -105273 |
| 18 | 268957 |
| 19 | 792414 |
| 20 | 1974312 |
| 21 | 825753 |
| 22 | -2605185 |
| 23 | -9778671 |
| 24 | -9956433 |
| 25 | -4944978 |
| 26 | 19214991 |
| 27 | 57418523 |
| 28 | 78518664 |
| 29 | 60044976 |
| 30 | -124946361 |
| 31 | -247193622 |
| 32 | -634049649 |
| 33 | -623771424 |
| 34 | 218263050 |