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 | 1 |
| 4 | -1 |
| 5 | -3 |
| 6 | 3 |
| 7 | -1 |
| 8 | 1 |
| 9 | 1 |
| 10 | -43 |
| 11 | 1 |
| 12 | 5 |
| 13 | 19 |
| 14 | -1 |
| 15 | -7 |
| 16 | -5 |
| 17 | 1 |
| 18 | -2005 |
| 19 | 1 |
| 20 | -1 |
| 21 | 149 |
| 22 | -193 |
| 23 | -1 |
| 24 | -3 |
| 25 | -79243 |
| 26 | 1243 |
| 27 | 1253 |
| 28 | -7 |
| 29 | 51 |
| 30 | 581 |
| 31 | -1 |
| 32 | 3093 |
| 33 | 1 |
| 34 | 155491 |
| 35 | 919 |
| 36 | 1 |
| 37 | -1 |
| 38 | 15833 |
| 39 | -877 |
| 40 | -4295498497 |
| 41 | 5129369 |
| 42 | 31 |
| 43 | 5779339 |
| 44 | -69187 |
| 45 | -29 |
| 46 | 6745 |
| 47 | 1 |
| 48 | 181 |
| 49 | 1 |
| 50 | 69197 |
| 51 | -397 |
| 52 | -117433 |
| 53 | -101 |
| 54 | -1 |
| 55 | 1 |
| 56 | 2759 |
| 57 | 1 |
| 58 | -29479 |
| 59 | 1 |
| 60 | -5626288431709 |
| 61 | 29669 |
| 62 | -1 |
| 63 | -132239 |
| 64 | -1 |
| 65 | -1 |
| 66 | 14591 |
| 67 | -2267959 |
| 68 | -3187 |
| 69 | 787250461 |