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 | -2 |
| 3 | -1 |
| 4 | 1 |
| 5 | 0 |
| 6 | -3 |
| 7 | -3 |
| 8 | -2 |
| 9 | -5 |
| 10 | -11 |
| 11 | -16 |
| 12 | -23 |
| 13 | -39 |
| 14 | -66 |
| 15 | -105 |
| 16 | -167 |
| 17 | -272 |
| 18 | -443 |
| 19 | -715 |
| 20 | -1154 |
| 21 | -1869 |
| 22 | -3027 |
| 23 | -4896 |
| 24 | -7919 |
| 25 | -12815 |
| 26 | -20738 |
| 27 | -33553 |
| 28 | -54287 |
| 29 | -87840 |
| 30 | -142131 |
| 31 | -229971 |
| 32 | -372098 |
| 33 | -602069 |
| 34 | -974171 |
| 35 | -1576240 |
| 36 | -2550407 |
| 37 | -4126647 |
| 38 | -6677058 |
| 39 | -10803705 |