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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | -2 |
| 5 | -1 |
| 6 | 1 |
| 7 | -3 |
| 8 | 18 |
| 9 | 9 |
| 10 | -1 |
| 11 | 17 |
| 12 | 3 |
| 13 | 1 |
| 14 | -35 |
| 15 | -7 |
| 16 | -15 |
| 17 | 57 |
| 18 | -1 |
| 19 | 339 |
| 20 | -381 |
| 21 | 3 |
| 22 | -7 |
| 23 | -969 |
| 24 | -1213 |
| 25 | -1 |
| 26 | 3 |
| 27 | 3 |
| 28 | -979 |
| 29 | 419 |
| 30 | 29 |
| 31 | -42735 |
| 32 | 21 |
| 33 | 731232 |
| 34 | 3 |
| 35 | 1445 |
| 36 | 2809731 |
| 37 | -4566981 |
| 38 | 557 |
| 39 | -19691 |
| 40 | -1 |
| 41 | 5 |
| 42 | 544371 |
| 43 | 5 |
| 44 | -475 |
| 45 | -1784691 |
| 46 | 9051 |
| 47 | 176870849 |
| 48 | 808683 |
| 49 | 280791301 |
| 50 | 1803 |
| 51 | -891775 |
| 52 | -3679 |
| 53 | -3733533 |
| 54 | -444406677 |
| 55 | 731480523 |
| 56 | 275091 |