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 | 2 |
| 2 | 0 |
| 3 | -4 |
| 4 | -6 |
| 5 | 0 |
| 6 | 12 |
| 7 | 16 |
| 8 | 0 |
| 9 | -28 |
| 10 | -36 |
| 11 | 0 |
| 12 | 60 |
| 13 | 76 |
| 14 | 0 |
| 15 | -120 |
| 16 | -150 |
| 17 | 0 |
| 18 | 228 |
| 19 | 280 |
| 20 | 0 |
| 21 | -416 |
| 22 | -504 |
| 23 | 0 |
| 24 | 732 |
| 25 | 878 |
| 26 | 0 |
| 27 | -1252 |
| 28 | -1488 |
| 29 | 0 |
| 30 | 2088 |
| 31 | 2464 |
| 32 | 0 |
| 33 | -3408 |
| 34 | -3996 |
| 35 | 0 |
| 36 | 5460 |
| 37 | 6364 |
| 38 | 0 |
| 39 | -8600 |
| 40 | -9972 |
| 41 | 0 |
| 42 | 13344 |
| 43 | 15400 |
| 44 | 0 |
| 45 | -20424 |
| 46 | -23472 |
| 47 | 0 |
| 48 | 30876 |
| 49 | 35346 |
| 50 | 0 |
| 51 | -46152 |
| 52 | -52644 |