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 | -12 |
| 3 | -16 |
| 4 | 48 |
| 5 | 192 |
| 6 | 116 |
| 7 | -768 |
| 8 | -1980 |
| 9 | -496 |
| 10 | 7092 |
| 11 | 15360 |
| 12 | 2636 |
| 13 | -48192 |
| 14 | -97044 |
| 15 | -22864 |
| 16 | 256002 |
| 17 | 521280 |
| 18 | 191908 |
| 19 | -1096416 |
| 20 | -2405376 |
| 21 | -1290288 |
| 22 | 3823524 |
| 23 | 9570240 |
| 24 | 6907098 |
| 25 | -10634976 |
| 26 | -32922540 |
| 27 | -30209648 |
| 28 | 21729096 |
| 29 | 97815552 |
| 30 | 110674724 |
| 31 | -21257376 |
| 32 | -249464409 |
| 33 | -345423376 |
| 34 | -63028416 |
| 35 | 538288272 |
| 36 | 927732396 |
| 37 | 442024992 |
| 38 | -948626520 |
| 39 | -2154606896 |