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 | -4 |
| 5 | -8 |
| 6 | -13 |
| 7 | -17 |
| 8 | -17 |
| 9 | -9 |
| 10 | 12 |
| 11 | 50 |
| 12 | 105 |
| 13 | 169 |
| 14 | 221 |
| 15 | 223 |
| 16 | 120 |
| 17 | -152 |
| 18 | -645 |
| 19 | -1361 |
| 20 | -2197 |
| 21 | -2881 |
| 22 | -2920 |
| 23 | -1598 |
| 24 | 1921 |
| 25 | 8321 |
| 26 | 17641 |
| 27 | 28559 |
| 28 | 37556 |
| 29 | 38232 |
| 30 | 21267 |
| 31 | -24257 |
| 32 | -107337 |
| 33 | -228649 |
| 34 | -371228 |
| 35 | -489550 |
| 36 | -500535 |
| 37 | -282871 |
| 38 | 306021 |