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 | 1 |
| 2 | 1 |
| 3 | -3 |
| 4 | 1 |
| 5 | 2 |
| 6 | -5 |
| 7 | -6 |
| 8 | 9 |
| 9 | 1 |
| 10 | 3 |
| 11 | -6 |
| 12 | -17 |
| 13 | 18 |
| 14 | 27 |
| 15 | -27 |
| 16 | 1 |
| 17 | 4 |
| 18 | -6 |
| 19 | -32 |
| 20 | 19 |
| 21 | 96 |
| 22 | -54 |
| 23 | -108 |
| 24 | 81 |
| 25 | 1 |
| 26 | 5 |
| 27 | -5 |
| 28 | -50 |
| 29 | 5 |
| 30 | 211 |
| 31 | -15 |
| 32 | -450 |
| 33 | 135 |
| 34 | 405 |
| 35 | -243 |
| 36 | 1 |
| 37 | 6 |
| 38 | -3 |
| 39 | -70 |
| 40 | -30 |
| 41 | 366 |
| 42 | 181 |
| 43 | -1098 |
| 44 | -270 |
| 45 | 1890 |
| 46 | -243 |
| 47 | -1458 |
| 48 | 729 |
| 49 | 1 |
| 50 | 7 |
| 51 | 0 |
| 52 | -91 |
| 53 | -91 |
| 54 | 546 |
| 55 | 637 |
| 56 | -2015 |
| 57 | -1911 |
| 58 | 4914 |
| 59 | 2457 |
| 60 | -7371 |
| 61 | 0 |
| 62 | 5103 |
| 63 | -2187 |
| 64 | 1 |
| 65 | 8 |
| 66 | 4 |
| 67 | -112 |
| 68 | -182 |
| 69 | 728 |
| 70 | 1456 |