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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | -1 |
| 4 | 2 |
| 5 | 0 |
| 6 | -2 |
| 7 | 3 |
| 8 | 1 |
| 9 | -1 |
| 10 | -3 |
| 11 | 4 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | -4 |
| 16 | 5 |
| 17 | -7 |
| 18 | -17 |
| 19 | 17 |
| 20 | 7 |
| 21 | -5 |
| 22 | 6 |
| 23 | -28 |
| 24 | -118 |
| 25 | 0 |
| 26 | 118 |
| 27 | 28 |
| 28 | -6 |
| 29 | 7 |
| 30 | -79 |
| 31 | -513 |
| 32 | -399 |
| 33 | 399 |
| 34 | 513 |
| 35 | 79 |
| 36 | -7 |
| 37 | 8 |
| 38 | -192 |
| 39 | -1844 |
| 40 | -2800 |
| 41 | 0 |
| 42 | 2800 |
| 43 | 1844 |
| 44 | 192 |
| 45 | -8 |
| 46 | 9 |
| 47 | -431 |
| 48 | -6049 |
| 49 | -13983 |
| 50 | -7849 |
| 51 | 7849 |
| 52 | 13983 |
| 53 | 6049 |
| 54 | 431 |
| 55 | -9 |
| 56 | 10 |
| 57 | -924 |
| 58 | -18954 |
| 59 | -61440 |
| 60 | -61318 |
| 61 | 0 |
| 62 | 61318 |
| 63 | 61440 |
| 64 | 18954 |
| 65 | 924 |
| 66 | -10 |