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 | -2 |
| 2 | -4 |
| 3 | 2 |
| 4 | 10 |
| 5 | 22 |
| 6 | -4 |
| 7 | -26 |
| 8 | -68 |
| 9 | -104 |
| 10 | -12 |
| 11 | 110 |
| 12 | 378 |
| 13 | 486 |
| 14 | 448 |
| 15 | -66 |
| 16 | -1130 |
| 17 | -2242 |
| 18 | -3044 |
| 19 | -2474 |
| 20 | -322 |
| 21 | 5106 |
| 22 | 11064 |
| 23 | 16954 |
| 24 | 17896 |
| 25 | 10440 |
| 26 | -8032 |
| 27 | -40132 |
| 28 | -74578 |
| 29 | -105754 |
| 30 | -108564 |
| 31 | -66534 |
| 32 | 42672 |
| 33 | 209858 |
| 34 | 421352 |
| 35 | 611946 |
| 36 | 690204 |
| 37 | 553534 |
| 38 | 82112 |
| 39 | -735082 |
| 40 | -1892200 |