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) |
|---|---|
| 1 | 0 |
| 2 | -3 |
| 3 | 22 |
| 4 | 44 |
| 5 | 355 |
| 6 | 710 |
| 7 | 1065 |
| 8 | 1420 |
| 9 | 1775 |
| 10 | 2130 |
| 11 | 2485 |
| 12 | 2840 |
| 13 | 3195 |
| 14 | 312689 |
| 15 | 1146408 |
| 16 | 5419351 |
| 17 | 10838702 |
| 18 | -6167950454 |
| 19 | -21053343141 |
| 20 | -42106686282 |
| 21 | -63160029423 |
| 22 | -84213372564 |
| 23 | -105266715705 |
| 24 | -8958937768937 |
| 25 | -17917875537874 |
| 26 | -428224593349304 |
| 27 | -856449186698608 |
| 28 | -6134899525417045 |