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 | 3 |
| 3 | 4 |
| 4 | 5 |
| 5 | 6 |
| 6 | 6 |
| 7 | 0 |
| 8 | -27 |
| 9 | -110 |
| 10 | -319 |
| 11 | -780 |
| 12 | -1702 |
| 13 | -3404 |
| 14 | -6315 |
| 15 | -10864 |
| 16 | -17051 |
| 17 | -23238 |
| 18 | -23238 |
| 19 | 0 |
| 20 | 87021 |
| 21 | 325358 |
| 22 | 890077 |
| 23 | 2107560 |
| 24 | 4542526 |
| 25 | 9085052 |
| 26 | 16950573 |
| 27 | 29354524 |
| 28 | 46296905 |
| 29 | 63239286 |
| 30 | 63239286 |
| 31 | 0 |
| 32 | -236031147 |
| 33 | -880918070 |
| 34 | -2406788599 |
| 35 | -5694626340 |