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 | 0 |
| 4 | 0 |
| 5 | -1 |
| 6 | 1 |
| 7 | -1 |
| 8 | 2 |
| 9 | -2 |
| 10 | 2 |
| 11 | -4 |
| 12 | 6 |
| 13 | -8 |
| 14 | 11 |
| 15 | -13 |
| 16 | 16 |
| 17 | -23 |
| 18 | 32 |
| 19 | -44 |
| 20 | 61 |
| 21 | -80 |
| 22 | 102 |
| 23 | -133 |
| 24 | 178 |
| 25 | -243 |
| 26 | 331 |
| 27 | -441 |
| 28 | 579 |
| 29 | -759 |
| 30 | 1001 |
| 31 | -1335 |
| 32 | 1792 |
| 33 | -2398 |
| 34 | 3186 |
| 35 | -4205 |
| 36 | 5537 |
| 37 | -7320 |
| 38 | 9734 |
| 39 | -12975 |
| 40 | 17266 |
| 41 | -22893 |
| 42 | 30267 |
| 43 | -40004 |
| 44 | 52968 |
| 45 | -70282 |
| 46 | 93348 |
| 47 | -123900 |
| 48 | 164179 |
| 49 | -217277 |