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 | 0 |
| 3 | 2 |
| 4 | -1 |
| 5 | 4 |
| 6 | -2 |
| 7 | 5 |
| 8 | -1 |
| 9 | 4 |
| 10 | 3 |
| 11 | -2 |
| 12 | 16 |
| 13 | -21 |
| 14 | 47 |
| 15 | -62 |
| 16 | 104 |
| 17 | -131 |
| 18 | 191 |
| 19 | -229 |
| 20 | 304 |
| 21 | -344 |
| 22 | 420 |
| 23 | -437 |
| 24 | 477 |
| 25 | -413 |
| 26 | 336 |
| 27 | -76 |
| 28 | -270 |
| 29 | 927 |
| 30 | -1792 |
| 31 | 3155 |
| 32 | -4904 |
| 33 | 7402 |
| 34 | -10519 |
| 35 | 14694 |
| 36 | -19761 |
| 37 | 26226 |
| 38 | -33847 |
| 39 | 43162 |
| 40 | -53776 |
| 41 | 66178 |
| 42 | -79679 |
| 43 | 94562 |
| 44 | -109606 |
| 45 | 124618 |
| 46 | -137468 |
| 47 | 147061 |