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 | 1 |
| 5 | -6 |
| 6 | 7 |
| 7 | -2 |
| 8 | 1 |
| 9 | 1 |
| 10 | -23 |
| 11 | 46 |
| 12 | -47 |
| 13 | 26 |
| 14 | -3 |
| 15 | 1 |
| 16 | 1 |
| 17 | -76 |
| 18 | 306 |
| 19 | -536 |
| 20 | 459 |
| 21 | -232 |
| 22 | 82 |
| 23 | -4 |
| 24 | 1 |
| 25 | 1 |
| 26 | -237 |
| 27 | 1919 |
| 28 | -5046 |
| 29 | 6965 |
| 30 | -5995 |
| 31 | 3109 |
| 32 | -958 |
| 33 | 247 |
| 34 | -5 |
| 35 | 1 |
| 36 | 1 |
| 37 | -722 |
| 38 | 11265 |
| 39 | -44634 |
| 40 | 91730 |
| 41 | -113538 |
| 42 | 90417 |
| 43 | -49398 |
| 44 | 17778 |
| 45 | -3630 |
| 46 | 737 |
| 47 | -6 |
| 48 | 1 |
| 49 | 1 |
| 50 | -2179 |
| 51 | 62836 |
| 52 | -381037 |
| 53 | 1099549 |
| 54 | -1878718 |
| 55 | 2123525 |
| 56 | -1658537 |
| 57 | 898985 |
| 58 | -346886 |
| 59 | 93377 |
| 60 | -13109 |
| 61 | 2200 |
| 62 | -7 |
| 63 | 1 |