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 | -2 |
| 3 | -1 |
| 4 | 3 |
| 5 | 3 |
| 6 | -4 |
| 7 | -7 |
| 8 | 4 |
| 9 | 14 |
| 10 | -1 |
| 11 | -25 |
| 12 | -9 |
| 13 | 40 |
| 14 | 33 |
| 15 | -56 |
| 16 | -82 |
| 17 | 63 |
| 18 | 171 |
| 19 | -37 |
| 20 | -316 |
| 21 | -71 |
| 22 | 524 |
| 23 | 350 |
| 24 | -769 |
| 25 | -945 |
| 26 | 943 |
| 27 | 2064 |
| 28 | -767 |
| 29 | -3952 |
| 30 | -354 |
| 31 | 6783 |
| 32 | 3539 |
| 33 | -10381 |
| 34 | -10676 |
| 35 | 13625 |
| 36 | 24596 |
| 37 | -13330 |
| 38 | -48897 |
| 39 | 2359 |
| 40 | 86823 |
| 41 | 33208 |
| 42 | -138079 |
| 43 | -117672 |
| 44 | 191694 |
| 45 | 288959 |
| 46 | -212101 |
| 47 | -598325 |
| 48 | 114836 |
| 49 | 1099385 |
| 50 | 271388 |