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 | -5 |
| 3 | 5 |
| 4 | 1 |
| 5 | -11 |
| 6 | 15 |
| 7 | -3 |
| 8 | -23 |
| 9 | 41 |
| 10 | -21 |
| 11 | -43 |
| 12 | 105 |
| 13 | -83 |
| 14 | -65 |
| 15 | 253 |
| 16 | -271 |
| 17 | -47 |
| 18 | 571 |
| 19 | -795 |
| 20 | 177 |
| 21 | 1189 |
| 22 | -2161 |
| 23 | 1149 |
| 24 | 2201 |
| 25 | -5511 |
| 26 | 4459 |
| 27 | 3253 |
| 28 | -13223 |
| 29 | 14429 |
| 30 | 2047 |
| 31 | -29699 |
| 32 | 42081 |
| 33 | -10335 |
| 34 | -61445 |
| 35 | 113861 |
| 36 | -62751 |
| 37 | -112555 |
| 38 | 289167 |
| 39 | -239363 |
| 40 | -162359 |
| 41 | 690889 |
| 42 | -767893 |
| 43 | -85355 |
| 44 | 1544137 |
| 45 | -2226675 |
| 46 | 597183 |
| 47 | 3173629 |