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 | 0 |
| 2 | 0 |
| 3 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | 2 |
| 7 | -3 |
| 8 | 4 |
| 9 | -5 |
| 10 | 6 |
| 11 | -8 |
| 12 | 11 |
| 13 | -13 |
| 14 | 16 |
| 15 | -21 |
| 16 | 27 |
| 17 | -32 |
| 18 | 39 |
| 19 | -49 |
| 20 | 61 |
| 21 | -73 |
| 22 | 87 |
| 23 | -107 |
| 24 | 131 |
| 25 | -155 |
| 26 | 184 |
| 27 | -223 |
| 28 | 267 |
| 29 | -315 |
| 30 | 372 |
| 31 | -443 |
| 32 | 526 |
| 33 | -617 |
| 34 | 722 |
| 35 | -852 |
| 36 | 1002 |
| 37 | -1167 |
| 38 | 1359 |
| 39 | -1590 |
| 40 | 1854 |
| 41 | -2148 |
| 42 | 2488 |
| 43 | -2888 |
| 44 | 3346 |
| 45 | -3859 |
| 46 | 4444 |
| 47 | -5128 |
| 48 | 5909 |
| 49 | -6779 |
| 50 | 7773 |