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) |
|---|---|
| 2 | 0 |
| 3 | -1 |
| 4 | 0 |
| 5 | 0 |
| 6 | -5 |
| 7 | 1 |
| 8 | 0 |
| 9 | 0 |
| 10 | -13 |
| 11 | 0 |
| 12 | -145 |
| 13 | 5 |
| 14 | 0 |
| 15 | 0 |
| 16 | -25 |
| 17 | 0 |
| 18 | -3805 |
| 19 | 0 |
| 20 | 0 |
| 21 | 125 |
| 22 | 0 |
| 23 | 0 |
| 24 | 53 |
| 25 | 569 |
| 26 | -401 |
| 27 | 0 |
| 28 | 0 |
| 29 | -851525 |
| 30 | 73 |
| 31 | 0 |
| 32 | 0 |
| 33 | 149 |
| 34 | 0 |
| 35 | -9305 |
| 36 | 0 |
| 37 | -385645 |
| 38 | 0 |
| 39 | 0 |
| 40 | -85 |
| 41 | 0 |
| 42 | -82596761 |
| 43 | 0 |
| 44 | 126985 |
| 45 | -785 |
| 46 | 0 |
| 47 | 0 |
| 48 | 0 |
| 49 | 0 |
| 50 | -1321693313 |
| 51 | 1517 |
| 52 | 0 |
| 53 | 4574225 |
| 54 | 0 |
| 55 | 1025 |
| 56 | 0 |
| 57 | -134485 |
| 58 | 0 |
| 59 | -535979945 |
| 60 | 63445 |
| 61 | 0 |
| 62 | -145 |
| 63 | 0 |
| 64 | 0 |
| 65 | 7170685 |
| 66 | -19805 |
| 67 | 0 |
| 68 | 55335641 |
| 69 | 0 |
| 70 | -167273125693 |
| 71 | 3793 |
| 72 | 0 |
| 73 | 0 |
| 74 | -27765559705 |
| 75 | 0 |
| 76 | 0 |
| 77 | -427316305 |
| 78 | -1027776565 |
| 79 | 2564801 |
| 80 | 5534176685 |