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 | 3 |
| 3 | 5 |
| 4 | 5 |
| 5 | 19 |
| 6 | 35 |
| 7 | 331 |
| 8 | 65 |
| 9 | 18265 |
| 10 | 4433 |
| 11 | 141349 |
| 12 | 18863 |
| 13 | 1035215 |
| 14 | 14705 |
| 15 | 9158903 |
| 16 | 6702403 |
| 17 | -34376687 |
| 18 | -21392575 |
| 19 | -33594289475 |
| 20 | -2206770805 |
| 21 | -4905856636525 |
| 22 | -617315066615 |
| 23 | -1713253866399725 |
| 24 | -551582580432325 |
| 25 | -51270656805872335 |
| 26 | -180184164588301 |
| 27 | -1630191679256007299 |