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 | 3 |
| 1 | 5 |
| 2 | -8 |
| 3 | 21 |
| 4 | -47 |
| 5 | 84 |
| 6 | -108 |
| 7 | 53 |
| 8 | 207 |
| 9 | -876 |
| 10 | 2289 |
| 11 | -5097 |
| 12 | 10770 |
| 13 | -22720 |
| 14 | 48489 |
| 15 | -103569 |
| 16 | 217292 |
| 17 | -440178 |
| 18 | 848628 |
| 19 | -1533887 |
| 20 | 2542431 |
| 21 | -3695469 |
| 22 | 4141675 |
| 23 | -1365090 |
| 24 | -10867236 |
| 25 | 46576386 |
| 26 | -135501531 |
| 27 | 338590821 |
| 28 | -778823106 |
| 29 | 1704048861 |
| 30 | -3617744616 |
| 31 | 7553704652 |
| 32 | -15651526743 |
| 33 | 32346059748 |
| 34 | -66772731098 |