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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | -2 |
| 6 | -3 |
| 7 | -3 |
| 8 | -2 |
| 9 | 0 |
| 10 | 0 |
| 11 | 3 |
| 12 | 6 |
| 13 | 8 |
| 14 | 8 |
| 15 | 25 |
| 16 | 25 |
| 17 | 22 |
| 18 | 16 |
| 19 | 8 |
| 20 | 0 |
| 21 | 0 |
| 22 | -25 |
| 23 | -50 |
| 24 | -72 |
| 25 | -88 |
| 26 | -96 |
| 27 | -96 |
| 28 | -427 |
| 29 | -427 |
| 30 | -402 |
| 31 | -352 |
| 32 | -280 |
| 33 | -192 |
| 34 | -96 |
| 35 | 0 |
| 36 | 0 |
| 37 | 427 |
| 38 | 854 |
| 39 | 1256 |
| 40 | 1608 |
| 41 | 1888 |
| 42 | 2080 |
| 43 | 2176 |
| 44 | 2176 |
| 45 | 12465 |
| 46 | 12465 |
| 47 | 12038 |
| 48 | 11184 |
| 49 | 9928 |
| 50 | 8320 |
| 51 | 6432 |
| 52 | 4352 |
| 53 | 2176 |
| 54 | 0 |