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 | 0 |
| 2 | 1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | -2 |
| 8 | -3 |
| 9 | 3 |
| 10 | 11 |
| 11 | -11 |
| 12 | -31 |
| 13 | 31 |
| 14 | 101 |
| 15 | -101 |
| 16 | -328 |
| 17 | 328 |
| 18 | 1102 |
| 19 | -1102 |
| 20 | -3760 |
| 21 | 3760 |
| 22 | 13036 |
| 23 | -13036 |
| 24 | -45750 |
| 25 | 45750 |
| 26 | 162262 |
| 27 | -162262 |
| 28 | -580638 |
| 29 | 580638 |
| 30 | 2093802 |
| 31 | -2093802 |
| 32 | -7601043 |
| 33 | 7601043 |
| 34 | 27756627 |
| 35 | -27756627 |
| 36 | -101888163 |