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 | 4 |
| 2 | 4 |
| 3 | -4 |
| 4 | -12 |
| 5 | -8 |
| 6 | 12 |
| 7 | 32 |
| 8 | 20 |
| 9 | -28 |
| 10 | -72 |
| 11 | -48 |
| 12 | 60 |
| 13 | 152 |
| 14 | 96 |
| 15 | -120 |
| 16 | -300 |
| 17 | -184 |
| 18 | 228 |
| 19 | 560 |
| 20 | 344 |
| 21 | -416 |
| 22 | -1008 |
| 23 | -608 |
| 24 | 732 |
| 25 | 1756 |
| 26 | 1048 |
| 27 | -1252 |
| 28 | -2976 |
| 29 | -1768 |
| 30 | 2088 |
| 31 | 4928 |
| 32 | 2900 |
| 33 | -3408 |
| 34 | -7992 |
| 35 | -4672 |
| 36 | 5460 |
| 37 | 12728 |
| 38 | 7408 |
| 39 | -8600 |
| 40 | -19944 |
| 41 | -11544 |
| 42 | 13344 |
| 43 | 30800 |
| 44 | 17744 |
| 45 | -20424 |