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 | 2 |
| 1 | -4 |
| 2 | 8 |
| 3 | -12 |
| 4 | 24 |
| 5 | -40 |
| 6 | 38 |
| 7 | -96 |
| 8 | 138 |
| 9 | -134 |
| 10 | 316 |
| 11 | -384 |
| 12 | 384 |
| 13 | -790 |
| 14 | 982 |
| 15 | -1168 |
| 16 | 1976 |
| 17 | -2400 |
| 18 | 2904 |
| 19 | -4464 |
| 20 | 5632 |
| 21 | -6956 |
| 22 | 9904 |
| 23 | -12320 |
| 24 | 15186 |
| 25 | -20938 |
| 26 | 26000 |
| 27 | -32008 |
| 28 | 42560 |
| 29 | -52278 |
| 30 | 64458 |
| 31 | -83736 |
| 32 | 102294 |
| 33 | -125428 |
| 34 | 159288 |
| 35 | -193908 |
| 36 | 236632 |
| 37 | -295612 |
| 38 | 358170 |
| 39 | -434364 |
| 40 | 535958 |
| 41 | -646032 |
| 42 | 778504 |
| 43 | -950552 |
| 44 | 1139784 |
| 45 | -1367002 |
| 46 | 1654268 |
| 47 | -1972508 |
| 48 | 2353214 |
| 49 | -2825722 |
| 50 | 3355344 |
| 51 | -3983820 |
| 52 | 4749672 |
| 53 | -5614558 |
| 54 | 6634830 |