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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 2 |
| 6 | 2 |
| 7 | 0 |
| 8 | -5 |
| 9 | -2 |
| 10 | -2 |
| 11 | 8 |
| 12 | 38 |
| 13 | 20 |
| 14 | 20 |
| 15 | -48 |
| 16 | -269 |
| 17 | -138 |
| 18 | -138 |
| 19 | 392 |
| 20 | 2194 |
| 21 | 1132 |
| 22 | 1132 |
| 23 | -3344 |
| 24 | -19010 |
| 25 | -9812 |
| 26 | -9812 |
| 27 | 30032 |
| 28 | 172332 |
| 29 | 89000 |
| 30 | 89000 |
| 31 | -279136 |
| 32 | -1613629 |
| 33 | -833626 |
| 34 | -833626 |
| 35 | 2663432 |
| 36 | 15485978 |
| 37 | 8002172 |
| 38 | 8002172 |
| 39 | -25938768 |
| 40 | -151520246 |
| 41 | -78309372 |
| 42 | -78309372 |