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 | 0 |
| 3 | -5 |
| 4 | -16 |
| 5 | -24 |
| 6 | 15 |
| 7 | 197 |
| 8 | 576 |
| 9 | 724 |
| 10 | -1200 |
| 11 | -8832 |
| 12 | -22801 |
| 13 | -21293 |
| 14 | 76440 |
| 15 | 408795 |
| 16 | 922368 |
| 17 | 499104 |
| 18 | -4446588 |
| 19 | -19025060 |
| 20 | -37012416 |
| 21 | -1673992 |
| 22 | 245604832 |
| 23 | 880263936 |
| 24 | 1441226991 |
| 25 | -908700649 |
| 26 | -13088509200 |
| 27 | -40222012703 |
| 28 | -52991533744 |
| 29 | 88167061704 |
| 30 | 678172355415 |
| 31 | 1805175708261 |
| 32 | 1747974632448 |
| 33 | -6237554623536 |
| 34 | -34300087628480 |