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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -3 |
| 8 | 1 |
| 9 | -5 |
| 10 | -7 |
| 11 | -13 |
| 12 | -16 |
| 13 | 11 |
| 14 | -57 |
| 15 | 131 |
| 16 | -113 |
| 17 | 389 |
| 18 | 670 |
| 19 | 2311 |
| 20 | 3983 |
| 21 | 9 |
| 22 | 23647 |
| 23 | -81511 |
| 24 | 140576 |
| 25 | -484247 |
| 26 | -833503 |
| 27 | -5751815 |
| 28 | -14871471 |
| 29 | -17124617 |
| 30 | -147165662 |
| 31 | 710017141 |
| 32 | -2273917871 |
| 33 | 9644648819 |
| 34 | 11396432249 |
| 35 | 204006839259 |
| 36 | 808162720720 |