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 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 3 |
| 6 | -2 |
| 7 | 3 |
| 8 | 0 |
| 9 | 9 |
| 10 | -6 |
| 11 | 15 |
| 12 | -4 |
| 13 | 1 |
| 14 | -2 |
| 15 | 5 |
| 16 | 0 |
| 17 | 27 |
| 18 | -18 |
| 19 | 75 |
| 20 | -12 |
| 21 | 5 |
| 22 | -10 |
| 23 | 35 |
| 24 | -8 |
| 25 | 3 |
| 26 | -14 |
| 27 | 13 |
| 28 | -4 |
| 29 | 3 |
| 30 | -2 |
| 31 | 9 |
| 32 | 0 |
| 33 | 81 |
| 34 | -54 |
| 35 | 375 |
| 36 | -36 |
| 37 | 25 |
| 38 | -50 |
| 39 | 245 |
| 40 | -24 |
| 41 | 15 |
| 42 | -70 |
| 43 | 91 |
| 44 | -20 |
| 45 | 21 |
| 46 | -14 |
| 47 | 99 |
| 48 | -16 |
| 49 | 9 |
| 50 | -42 |
| 51 | 65 |
| 52 | -28 |
| 53 | -9 |
| 54 | -22 |
| 55 | 43 |
| 56 | -8 |
| 57 | 9 |
| 58 | -18 |
| 59 | 25 |
| 60 | -4 |
| 61 | 7 |
| 62 | -2 |
| 63 | 11 |
| 64 | 0 |
| 65 | 243 |
| 66 | -162 |
| 67 | 1875 |
| 68 | -108 |
| 69 | 125 |
| 70 | -250 |
| 71 | 1715 |
| 72 | -72 |
| 73 | 75 |
| 74 | -350 |
| 75 | 637 |
| 76 | -100 |
| 77 | 147 |
| 78 | -98 |
| 79 | 1089 |