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 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | -10 |
| 6 | 0 |
| 7 | 0 |
| 8 | 4 |
| 9 | 4 |
| 10 | -20 |
| 11 | -52 |
| 12 | 0 |
| 13 | -242 |
| 14 | 0 |
| 15 | -14 |
| 16 | 8 |
| 17 | -494 |
| 18 | 8 |
| 19 | -1004 |
| 20 | -40 |
| 21 | 8 |
| 22 | -104 |
| 23 | -2024 |
| 24 | 0 |
| 25 | 2 |
| 26 | -484 |
| 27 | 18 |
| 28 | 0 |
| 29 | -4066 |
| 30 | -28 |
| 31 | 0 |
| 32 | 16 |
| 33 | -92 |
| 34 | -988 |
| 35 | 8 |
| 36 | 16 |
| 37 | -16346 |
| 38 | -2008 |
| 39 | -470 |
| 40 | -80 |
| 41 | -32726 |
| 42 | 16 |
| 43 | -65492 |
| 44 | -208 |
| 45 | -12 |
| 46 | -4048 |
| 47 | -262096 |
| 48 | 0 |
| 49 | 38 |
| 50 | 4 |
| 51 | -970 |
| 52 | -968 |
| 53 | -1048522 |
| 54 | 36 |
| 55 | -64 |
| 56 | 0 |
| 57 | -1988 |
| 58 | -8132 |
| 59 | -2097092 |
| 60 | -56 |
| 61 | -4194242 |
| 62 | 0 |
| 63 | 38 |
| 64 | 32 |