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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 0 |
| 8 | -7 |
| 9 | -35 |
| 10 | -119 |
| 11 | -329 |
| 12 | -791 |
| 13 | -1715 |
| 14 | -3430 |
| 15 | -6419 |
| 16 | -11319 |
| 17 | -18767 |
| 18 | -28763 |
| 19 | -38759 |
| 20 | -38759 |
| 21 | 0 |
| 22 | 149205 |
| 23 | 571781 |
| 24 | 1613129 |
| 25 | 3964051 |
| 26 | 8934121 |
| 27 | 18874261 |
| 28 | 37748522 |
| 29 | 71705865 |
| 30 | 129080161 |
| 31 | 218205281 |
| 32 | 339081225 |
| 33 | 459957169 |
| 34 | 459957169 |
| 35 | 0 |
| 36 | -1749692735 |