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 | -1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 1 |
| 7 | 7 |
| 8 | -6 |
| 9 | 1 |
| 10 | -13 |
| 11 | -5 |
| 12 | 25 |
| 13 | -10 |
| 14 | 1 |
| 15 | 47 |
| 16 | -83 |
| 17 | -60 |
| 18 | 65 |
| 19 | -15 |
| 20 | 1 |
| 21 | 73 |
| 22 | 637 |
| 23 | -203 |
| 24 | -280 |
| 25 | 140 |
| 26 | -21 |
| 27 | 1 |
| 28 | -2447 |
| 29 | -1425 |
| 30 | 3710 |
| 31 | 77 |
| 32 | -910 |
| 33 | 266 |
| 34 | -28 |
| 35 | 1 |
| 36 | 16811 |
| 37 | -22341 |
| 38 | -21347 |
| 39 | 13146 |
| 40 | 2667 |
| 41 | -2394 |
| 42 | 462 |
| 43 | -36 |
| 44 | 1 |
| 45 | 15551 |
| 46 | 318149 |
| 47 | -50400 |
| 48 | -137435 |
| 49 | 30135 |
| 50 | 12999 |
| 51 | -5460 |
| 52 | 750 |
| 53 | -45 |
| 54 | 1 |
| 55 | -1726511 |
| 56 | -1415491 |
| 57 | 2465969 |
| 58 | 379940 |
| 59 | -579590 |
| 60 | 32109 |
| 61 | 43659 |
| 62 | -11220 |
| 63 | 1155 |
| 64 | -55 |