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 | -3 |
| 4 | 1 |
| 5 | 4 |
| 6 | -4 |
| 7 | -8 |
| 8 | 1 |
| 9 | 23 |
| 10 | -8 |
| 11 | -12 |
| 12 | -27 |
| 13 | 12 |
| 14 | 36 |
| 15 | 15 |
| 16 | 1 |
| 17 | 16 |
| 18 | -149 |
| 19 | -20 |
| 20 | 71 |
| 21 | 91 |
| 22 | 166 |
| 23 | -24 |
| 24 | -119 |
| 25 | -186 |
| 26 | -285 |
| 27 | 251 |
| 28 | -26 |
| 29 | 28 |
| 30 | 761 |
| 31 | -32 |
| 32 | 1 |
| 33 | -199 |
| 34 | -679 |
| 35 | -827 |
| 36 | -310 |
| 37 | 36 |
| 38 | 970 |
| 39 | 1572 |
| 40 | 1821 |
| 41 | 40 |
| 42 | -2631 |
| 43 | -44 |
| 44 | 331 |
| 45 | -5628 |
| 46 | 1772 |
| 47 | -48 |
| 48 | -495 |
| 49 | 3051 |
| 50 | 2546 |
| 51 | 6697 |
| 52 | -1715 |
| 53 | 52 |
| 54 | 2791 |
| 55 | -7425 |
| 56 | -8007 |
| 57 | -10869 |
| 58 | -3653 |
| 59 | -60 |