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 | 1 |
| 4 | -3 |
| 5 | 6 |
| 6 | -8 |
| 7 | 3 |
| 8 | 22 |
| 9 | -92 |
| 10 | 252 |
| 11 | -578 |
| 12 | 1189 |
| 13 | -2255 |
| 14 | 3991 |
| 15 | -6617 |
| 16 | 10245 |
| 17 | -14626 |
| 18 | 18666 |
| 19 | -19635 |
| 20 | 12104 |
| 21 | 13090 |
| 22 | -69122 |
| 23 | 171478 |
| 24 | -332718 |
| 25 | 552138 |
| 26 | -798629 |
| 27 | 982514 |
| 28 | -901485 |
| 29 | 116219 |
| 30 | 2351842 |
| 31 | -8715135 |
| 32 | 23856206 |
| 33 | -57926011 |
| 34 | 130281064 |
| 35 | -273804584 |
| 36 | 535390333 |