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 | 0 |
| 3 | -2 |
| 4 | 1 |
| 5 | -2 |
| 6 | 3 |
| 7 | -3 |
| 8 | 5 |
| 9 | -6 |
| 10 | 8 |
| 11 | -11 |
| 12 | 14 |
| 13 | -19 |
| 14 | 25 |
| 15 | -33 |
| 16 | 44 |
| 17 | -58 |
| 18 | 77 |
| 19 | -102 |
| 20 | 135 |
| 21 | -179 |
| 22 | 237 |
| 23 | -314 |
| 24 | 416 |
| 25 | -551 |
| 26 | 730 |
| 27 | -967 |
| 28 | 1281 |
| 29 | -1697 |
| 30 | 2248 |
| 31 | -2978 |
| 32 | 3945 |
| 33 | -5226 |
| 34 | 6923 |
| 35 | -9171 |
| 36 | 12149 |
| 37 | -16094 |
| 38 | 21320 |
| 39 | -28243 |
| 40 | 37414 |
| 41 | -49563 |
| 42 | 65657 |
| 43 | -86977 |
| 44 | 115220 |
| 45 | -152634 |
| 46 | 202197 |
| 47 | -267854 |
| 48 | 354831 |
| 49 | -470051 |
| 50 | 622685 |
| 51 | -824882 |