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 | 0 |
| 1 | 1 |
| 2 | -7 |
| 3 | 1 |
| 4 | -4 |
| 5 | -25 |
| 6 | 1 |
| 7 | -6 |
| 8 | 3 |
| 9 | -98 |
| 10 | 3 |
| 11 | -24 |
| 12 | 36 |
| 13 | -8 |
| 14 | -1167 |
| 15 | 3 |
| 16 | -30 |
| 17 | 75 |
| 18 | -40 |
| 19 | -10 |
| 20 | -4650 |
| 21 | 5 |
| 22 | -60 |
| 23 | 210 |
| 24 | -220 |
| 25 | 35 |
| 26 | -56 |
| 27 | -30930 |
| 28 | 45 |
| 29 | -630 |
| 30 | 2835 |
| 31 | -4620 |
| 32 | 2205 |
| 33 | -378 |
| 34 | -1589 |
| 35 | -1111860 |
| 36 | 315 |
| 37 | -5040 |
| 38 | 27720 |
| 39 | -62160 |
| 40 | 52500 |
| 41 | -13104 |
| 42 | -4424 |
| 43 | -36304 |
| 44 | -31100895 |
| 45 | 35 |
| 46 | -630 |
| 47 | 4095 |
| 48 | -11760 |
| 49 | 14700 |
| 50 | -6888 |