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 | 2 |
| 3 | 1 |
| 4 | 2 |
| 5 | 0 |
| 6 | 2 |
| 7 | -1 |
| 8 | 3 |
| 9 | -2 |
| 10 | 5 |
| 11 | -4 |
| 12 | 8 |
| 13 | -8 |
| 14 | 13 |
| 15 | -15 |
| 16 | 22 |
| 17 | -27 |
| 18 | 38 |
| 19 | -48 |
| 20 | 66 |
| 21 | -85 |
| 22 | 115 |
| 23 | -150 |
| 24 | 201 |
| 25 | -264 |
| 26 | 352 |
| 27 | -464 |
| 28 | 617 |
| 29 | -815 |
| 30 | 1082 |
| 31 | -1431 |
| 32 | 1898 |
| 33 | -2512 |
| 34 | 3330 |
| 35 | -4409 |
| 36 | 5843 |
| 37 | -7738 |
| 38 | 10253 |
| 39 | -13580 |
| 40 | 17992 |
| 41 | -23832 |
| 42 | 31573 |
| 43 | -41823 |
| 44 | 55406 |
| 45 | -73395 |
| 46 | 97230 |
| 47 | -128800 |
| 48 | 170626 |
| 49 | -226029 |
| 50 | 299427 |
| 51 | -396654 |