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 | 12 |
| 2 | 144 |
| 3 | 1103 |
| 4 | 7878 |
| 5 | 51800 |
| 6 | 330951 |
| 7 | 2070564 |
| 8 | 12830802 |
| 9 | 79045687 |
| 10 | 485544940 |
| 11 | 2977554668 |
| 12 | 18243896709 |
| 13 | 111730524932 |
| 14 | 684100356564 |
| 15 | 4188038973519 |
| 16 | 25637266851722 |
| 17 | 156933921465968 |
| 18 | 960624347689059 |
| 19 | 5880116589637756 |