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 | 2 |
| 2 | 68 |
| 3 | 10812 |
| 4 | 135776 |
| 5 | 2818830 |
| 6 | 19906740 |
| 7 | 162700376 |
| 8 | 766650656 |
| 9 | 3696053370 |
| 10 | 13019727620 |
| 11 | 45166073172 |
| 12 | 128894476608 |
| 13 | 358710268742 |
| 14 | 876273071156 |
| 15 | 2086036196400 |
| 16 | 4529314688960 |
| 17 | 9603337631346 |
| 18 | 19024638124356 |
| 19 | 36902088232940 |