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 | 1020 |
| 4 | 6612 |
| 5 | 45932 |
| 6 | 329734 |
| 7 | 2346621 |
| 8 | 16555996 |
| 9 | 116824836 |
| 10 | 825944298 |
| 11 | 5841333854 |
| 12 | 41296838816 |
| 13 | 291917220483 |
| 14 | 2063599965447 |
| 15 | 14588455360112 |
| 16 | 103131522271050 |
| 17 | 729070029502689 |
| 18 | 5154026289337418 |
| 19 | 36435512589728099 |