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 | 1 |
| 2 | -65 |
| 3 | 730 |
| 4 | -4033 |
| 5 | 15626 |
| 6 | -47450 |
| 7 | 117650 |
| 8 | -257985 |
| 9 | 532171 |
| 10 | -1015690 |
| 11 | 1771562 |
| 12 | -2944090 |
| 13 | 4826810 |
| 14 | -7647250 |
| 15 | 11406980 |
| 16 | -16510913 |
| 17 | 24137570 |
| 18 | -34591115 |
| 19 | 47045882 |
| 20 | -63019658 |
| 21 | 85884500 |
| 22 | -115151530 |
| 23 | 148035890 |
| 24 | -188329050 |
| 25 | 244156251 |
| 26 | -313742650 |