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 | 2 |
| 2 | 0 |
| 3 | 4 |
| 4 | -3 |
| 5 | 6 |
| 6 | -3 |
| 7 | 8 |
| 8 | -15 |
| 9 | 28 |
| 10 | -24 |
| 11 | 12 |
| 12 | 0 |
| 13 | 14 |
| 14 | -48 |
| 15 | 96 |
| 16 | -95 |
| 17 | 18 |
| 18 | 55 |
| 19 | 20 |
| 20 | -180 |
| 21 | 232 |
| 22 | -120 |
| 23 | 24 |
| 24 | -35 |
| 25 | 76 |
| 26 | -168 |
| 27 | 460 |
| 28 | -580 |
| 29 | 30 |
| 30 | 515 |
| 31 | 32 |
| 32 | -927 |
| 33 | 804 |
| 34 | -288 |
| 35 | 456 |
| 36 | -497 |
| 37 | 38 |
| 38 | -360 |
| 39 | 1288 |
| 40 | -1169 |
| 41 | 42 |
| 42 | 847 |
| 43 | 44 |
| 44 | -2958 |
| 45 | 3700 |
| 46 | -528 |
| 47 | 48 |
| 48 | -2599 |
| 49 | 148 |
| 50 | 2526 |
| 51 | 2772 |
| 52 | -5537 |
| 53 | 54 |
| 54 | 595 |
| 55 | 5336 |
| 56 | -6930 |
| 57 | 3820 |
| 58 | -840 |
| 59 | 60 |
| 60 | -791 |
| 61 | 62 |
| 62 | -960 |
| 63 | 6448 |
| 64 | -12351 |
| 65 | 12936 |
| 66 | -3167 |
| 67 | 68 |
| 68 | -15435 |
| 69 | 6648 |
| 70 | 21365 |
| 71 | 72 |
| 72 | -26646 |
| 73 | 74 |
| 74 | -1368 |
| 75 | 35776 |
| 76 | -23730 |
| 77 | 8394 |
| 78 | -16548 |
| 79 | 80 |
| 80 | 7101 |