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 | -7 |
| 2 | 14 |
| 3 | 7 |
| 4 | -49 |
| 5 | 21 |
| 6 | 35 |
| 7 | 42 |
| 8 | -56 |
| 9 | -119 |
| 10 | 105 |
| 11 | -70 |
| 12 | 147 |
| 13 | 147 |
| 14 | -133 |
| 15 | -168 |
| 16 | -231 |
| 17 | 252 |
| 18 | -154 |
| 19 | 315 |
| 20 | 441 |
| 21 | 7 |
| 22 | -644 |
| 23 | -574 |
| 24 | 595 |
| 25 | -679 |
| 26 | 735 |
| 27 | 574 |
| 28 | 196 |
| 29 | -406 |
| 30 | -840 |
| 31 | 840 |
| 32 | -1470 |
| 33 | 854 |
| 34 | 1260 |
| 35 | 21 |
| 36 | -1617 |
| 37 | -966 |
| 38 | 1575 |
| 39 | -1176 |
| 40 | 1785 |
| 41 | 1470 |
| 42 | 35 |
| 43 | -1974 |
| 44 | -2058 |
| 45 | 1533 |
| 46 | -1988 |
| 47 | 1932 |
| 48 | 2387 |
| 49 | -301 |
| 50 | -2170 |
| 51 | -2016 |
| 52 | 3087 |
| 53 | -2422 |