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 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | -2 |
| 8 | 5 |
| 9 | 0 |
| 10 | -2 |
| 11 | 0 |
| 12 | 3 |
| 13 | 5 |
| 14 | -11 |
| 15 | 5 |
| 16 | 6 |
| 17 | 9 |
| 18 | -17 |
| 19 | -2 |
| 20 | 23 |
| 21 | -3 |
| 22 | -11 |
| 23 | -25 |
| 24 | 62 |
| 25 | -11 |
| 26 | -27 |
| 27 | -27 |
| 28 | 76 |
| 29 | 20 |
| 30 | -104 |
| 31 | 10 |
| 32 | 77 |
| 33 | 101 |
| 34 | -243 |
| 35 | 58 |
| 36 | 118 |
| 37 | 147 |
| 38 | -353 |
| 39 | -25 |
| 40 | 378 |
| 41 | 48 |
| 42 | -372 |
| 43 | -298 |
| 44 | 892 |
| 45 | -165 |
| 46 | -444 |
| 47 | -621 |
| 48 | 1524 |
| 49 | -128 |
| 50 | -1055 |
| 51 | -559 |
| 52 | 1869 |
| 53 | 575 |
| 54 | -2682 |
| 55 | 84 |
| 56 | 2054 |
| 57 | 1979 |
| 58 | -5325 |
| 59 | 844 |
| 60 | 2947 |