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 | 2 |
| 2 | -2 |
| 3 | 3 |
| 4 | -8 |
| 5 | 4 |
| 6 | 4 |
| 7 | -20 |
| 8 | 24 |
| 9 | -8 |
| 10 | 5 |
| 11 | -40 |
| 12 | 84 |
| 13 | -64 |
| 14 | 16 |
| 15 | 6 |
| 16 | -70 |
| 17 | 224 |
| 18 | -288 |
| 19 | 160 |
| 20 | -32 |
| 21 | 7 |
| 22 | -112 |
| 23 | 504 |
| 24 | -960 |
| 25 | 880 |
| 26 | -384 |
| 27 | 64 |
| 28 | 8 |
| 29 | -168 |
| 30 | 1008 |
| 31 | -2640 |
| 32 | 3520 |
| 33 | -2496 |
| 34 | 896 |
| 35 | -128 |
| 36 | 9 |
| 37 | -240 |
| 38 | 1848 |
| 39 | -6336 |
| 40 | 11440 |
| 41 | -11648 |
| 42 | 6720 |
| 43 | -2048 |
| 44 | 256 |
| 45 | 10 |
| 46 | -330 |
| 47 | 3168 |
| 48 | -13728 |
| 49 | 32032 |
| 50 | -43680 |
| 51 | 35840 |
| 52 | -17408 |
| 53 | 4608 |
| 54 | -512 |