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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 0 |
| 5 | 1 |
| 6 | -2 |
| 7 | 9 |
| 8 | 0 |
| 9 | 1 |
| 10 | 5 |
| 11 | -8 |
| 12 | 18 |
| 13 | 0 |
| 14 | 1 |
| 15 | -4 |
| 16 | 25 |
| 17 | -20 |
| 18 | 30 |
| 19 | 0 |
| 20 | 1 |
| 21 | 7 |
| 22 | -24 |
| 23 | 75 |
| 24 | -40 |
| 25 | 45 |
| 26 | 0 |
| 27 | 1 |
| 28 | -6 |
| 29 | 49 |
| 30 | -84 |
| 31 | 175 |
| 32 | -70 |
| 33 | 63 |
| 34 | 0 |
| 35 | 1 |
| 36 | 9 |
| 37 | -48 |
| 38 | 196 |
| 39 | -224 |
| 40 | 350 |
| 41 | -112 |
| 42 | 84 |
| 43 | 0 |
| 44 | 1 |
| 45 | -8 |
| 46 | 81 |
| 47 | -216 |
| 48 | 588 |
| 49 | -504 |
| 50 | 630 |
| 51 | -168 |
| 52 | 108 |
| 53 | 0 |
| 54 | 1 |
| 55 | 11 |
| 56 | -80 |
| 57 | 405 |
| 58 | -720 |
| 59 | 1470 |
| 60 | -1008 |
| 61 | 1050 |
| 62 | -240 |
| 63 | 135 |
| 64 | 0 |
| 65 | 1 |