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 | -16 |
| 3 | -64 |
| 4 | -160 |
| 5 | -320 |
| 6 | -560 |
| 7 | -896 |
| 8 | -1344 |
| 9 | -1920 |
| 10 | -2640 |
| 11 | -3520 |
| 12 | -4576 |
| 13 | -5824 |
| 14 | -7280 |
| 15 | -8960 |
| 16 | -10880 |
| 17 | -13056 |
| 18 | -15504 |
| 19 | -18240 |
| 20 | -21280 |
| 21 | -24640 |
| 22 | -28336 |
| 23 | -32384 |
| 24 | -36800 |
| 25 | -41600 |
| 26 | -46800 |
| 27 | -52416 |
| 28 | -58464 |
| 29 | -64960 |
| 30 | -71920 |
| 31 | -79360 |
| 32 | -87296 |
| 33 | -95744 |
| 34 | -104720 |
| 35 | -114240 |
| 36 | -124320 |
| 37 | -134976 |
| 38 | -146224 |
| 39 | -158080 |