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) |
|---|---|
| 1 | 8 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | -7 |
| 9 | 28 |
| 10 | -84 |
| 11 | 210 |
| 12 | -462 |
| 13 | 925 |
| 14 | -1729 |
| 15 | 3094 |
| 16 | -5460 |
| 17 | 9828 |
| 18 | -18564 |
| 19 | 37128 |
| 20 | -77519 |
| 21 | 164710 |
| 22 | -347984 |
| 23 | 719719 |
| 24 | -1444170 |
| 25 | 2796248 |
| 26 | -5200299 |
| 27 | 9230104 |
| 28 | -15459444 |
| 29 | 23888319 |
| 30 | -32317194 |
| 31 | 32317194 |
| 32 | 0 |
| 33 | -124040423 |
| 34 | 476768435 |
| 35 | -1358719271 |
| 36 | 3407426841 |