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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -2 |
| 4 | 1 |
| 5 | -4 |
| 6 | 2 |
| 7 | 1 |
| 8 | -6 |
| 9 | 6 |
| 10 | -1 |
| 11 | 1 |
| 12 | -8 |
| 13 | 12 |
| 14 | -4 |
| 15 | -2 |
| 16 | 1 |
| 17 | -10 |
| 18 | 20 |
| 19 | -10 |
| 20 | -10 |
| 21 | 10 |
| 22 | 1 |
| 23 | -12 |
| 24 | 30 |
| 25 | -20 |
| 26 | -30 |
| 27 | 60 |
| 28 | -30 |
| 29 | 1 |
| 30 | -14 |
| 31 | 42 |
| 32 | -35 |
| 33 | -70 |
| 34 | 210 |
| 35 | -210 |
| 36 | 76 |
| 37 | 1 |
| 38 | -16 |
| 39 | 56 |
| 40 | -56 |
| 41 | -140 |
| 42 | 560 |
| 43 | -840 |
| 44 | 608 |
| 45 | -173 |
| 46 | 1 |
| 47 | -18 |
| 48 | 72 |
| 49 | -84 |
| 50 | -252 |
| 51 | 1260 |
| 52 | -2520 |
| 53 | 2736 |
| 54 | -1557 |
| 55 | 363 |
| 56 | 1 |
| 57 | -20 |
| 58 | 90 |
| 59 | -120 |
| 60 | -420 |
| 61 | 2520 |
| 62 | -6300 |
| 63 | 9120 |
| 64 | -7785 |
| 65 | 3630 |
| 66 | -717 |