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 | 1 |
| 6 | -1 |
| 7 | 1 |
| 8 | 7 |
| 9 | -8 |
| 10 | 9 |
| 11 | -10 |
| 12 | 11 |
| 13 | -12 |
| 14 | 13 |
| 15 | -14 |
| 16 | 7 |
| 17 | 1 |
| 18 | -10 |
| 19 | 20 |
| 20 | -31 |
| 21 | 43 |
| 22 | -56 |
| 23 | 70 |
| 24 | -77 |
| 25 | 76 |
| 26 | -66 |
| 27 | 73 |
| 28 | -43 |
| 29 | 1 |
| 30 | 54 |
| 31 | -123 |
| 32 | 199 |
| 33 | -274 |
| 34 | 339 |
| 35 | -419 |
| 36 | 470 |
| 37 | -480 |
| 38 | 436 |
| 39 | -324 |
| 40 | 137 |
| 41 | 124 |
| 42 | -449 |
| 43 | 861 |
| 44 | -1332 |
| 45 | 1822 |
| 46 | -2278 |
| 47 | 2633 |
| 48 | -2813 |
| 49 | 2745 |
| 50 | -2366 |
| 51 | 1582 |
| 52 | -326 |
| 53 | -1430 |
| 54 | 3635 |
| 55 | -6225 |
| 56 | 9037 |
| 57 | -11836 |
| 58 | 14325 |
| 59 | -16106 |
| 60 | 16706 |
| 61 | -15615 |