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 | 3 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 0 |
| 6 | -1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 2 |
| 10 | 0 |
| 11 | 0 |
| 12 | -4 |
| 13 | 0 |
| 14 | 0 |
| 15 | 9 |
| 16 | 0 |
| 17 | 0 |
| 18 | -22 |
| 19 | 0 |
| 20 | 0 |
| 21 | 55 |
| 22 | 0 |
| 23 | 0 |
| 24 | -142 |
| 25 | 0 |
| 26 | 0 |
| 27 | 376 |
| 28 | 0 |
| 29 | 0 |
| 30 | -1011 |
| 31 | 0 |
| 32 | 0 |
| 33 | 2758 |
| 34 | 0 |
| 35 | 0 |
| 36 | -7614 |
| 37 | 0 |
| 38 | 0 |
| 39 | 21220 |
| 40 | 0 |
| 41 | 0 |
| 42 | -59630 |
| 43 | 0 |
| 44 | 0 |
| 45 | 168759 |
| 46 | 0 |
| 47 | 0 |
| 48 | -480533 |
| 49 | 0 |
| 50 | 0 |
| 51 | 1375676 |
| 52 | 0 |
| 53 | 0 |
| 54 | -3957075 |
| 55 | 0 |
| 56 | 0 |
| 57 | 11430582 |
| 58 | 0 |
| 59 | 0 |
| 60 | -33144264 |
| 61 | 0 |
| 62 | 0 |
| 63 | 96434321 |
| 64 | 0 |
| 65 | 0 |
| 66 | -281447954 |
| 67 | 0 |
| 68 | 0 |
| 69 | 823734157 |
| 70 | 0 |
| 71 | 0 |
| 72 | -2417092933 |
| 73 | 0 |
| 74 | 0 |