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 | -56 |
| 2 | -2296 |
| 3 | -13664 |
| 4 | -73976 |
| 5 | -175056 |
| 6 | -560224 |
| 7 | -941248 |
| 8 | -2367736 |
| 9 | -3320408 |
| 10 | -7177296 |
| 11 | -9018912 |
| 12 | -18050144 |
| 13 | -20792464 |
| 14 | -38591168 |
| 15 | -42713664 |
| 16 | -75768056 |
| 17 | -79512048 |
| 18 | -136136728 |
| 19 | -138661600 |
| 20 | -231248976 |
| 21 | -229664512 |
| 22 | -369775392 |
| 23 | -360435264 |
| 24 | -577727584 |
| 25 | -547050056 |
| 26 | -852491024 |
| 27 | -806859200 |
| 28 | -1243388608 |
| 29 | -1148624400 |
| 30 | -1751260224 |
| 31 | -1603232512 |