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 | 3 |
| 4 | -4 |
| 5 | 1 |
| 6 | -13 |
| 7 | 19 |
| 8 | -7 |
| 9 | 1 |
| 10 | 67 |
| 11 | -102 |
| 12 | 44 |
| 13 | -10 |
| 14 | 1 |
| 15 | -381 |
| 16 | 593 |
| 17 | -278 |
| 18 | 78 |
| 19 | -13 |
| 20 | 1 |
| 21 | 2307 |
| 22 | -3640 |
| 23 | 1795 |
| 24 | -568 |
| 25 | 121 |
| 26 | -16 |
| 27 | 1 |
| 28 | -14589 |
| 29 | 23231 |
| 30 | -11849 |
| 31 | 4051 |
| 32 | -999 |
| 33 | 173 |
| 34 | -19 |
| 35 | 1 |
| 36 | 95235 |
| 37 | -152650 |
| 38 | 79750 |
| 39 | -28770 |
| 40 | 7820 |
| 41 | -1598 |
| 42 | 234 |
| 43 | -22 |
| 44 | 1 |
| 45 | -636925 |
| 46 | 1025965 |
| 47 | -545680 |
| 48 | 204760 |
| 49 | -59650 |
| 50 | 13642 |
| 51 | -2392 |
| 52 | 304 |
| 53 | -25 |
| 54 | 1 |