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 | -3 |
| 2 | 1 |
| 3 | 8 |
| 4 | -6 |
| 5 | 1 |
| 6 | -21 |
| 7 | 25 |
| 8 | -9 |
| 9 | 1 |
| 10 | 55 |
| 11 | -90 |
| 12 | 51 |
| 13 | -12 |
| 14 | 1 |
| 15 | -144 |
| 16 | 300 |
| 17 | -234 |
| 18 | 86 |
| 19 | -15 |
| 20 | 1 |
| 21 | 377 |
| 22 | -954 |
| 23 | 951 |
| 24 | -480 |
| 25 | 130 |
| 26 | -18 |
| 27 | 1 |
| 28 | -987 |
| 29 | 2939 |
| 30 | -3573 |
| 31 | 2305 |
| 32 | -855 |
| 33 | 183 |
| 34 | -21 |
| 35 | 1 |
| 36 | 2584 |
| 37 | -8850 |
| 38 | 12707 |
| 39 | -10008 |
| 40 | 4740 |
| 41 | -1386 |
| 42 | 245 |
| 43 | -24 |
| 44 | 1 |
| 45 | -6765 |
| 46 | 26195 |
| 47 | -43398 |
| 48 | 40426 |
| 49 | -23373 |
| 50 | 8715 |