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 | 8 |
| 2 | -248 |
| 3 | 1952 |
| 4 | -8440 |
| 5 | 25008 |
| 6 | -60512 |
| 7 | 134464 |
| 8 | -270584 |
| 9 | 474344 |
| 10 | -775248 |
| 11 | 1288416 |
| 12 | -2059360 |
| 13 | 2970352 |
| 14 | -4168384 |
| 15 | 6101952 |
| 16 | -8659192 |
| 17 | 11358864 |
| 18 | -14704664 |
| 19 | 19808800 |
| 20 | -26383440 |
| 21 | 32809216 |
| 22 | -39940896 |
| 23 | 51490752 |
| 24 | -66022496 |
| 25 | 78150008 |
| 26 | -92080912 |
| 27 | 115265600 |
| 28 | -141859520 |