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 | 1011 |
| 4 | 6612 |
| 5 | 38144 |
| 6 | 211471 |
| 7 | 1124120 |
| 8 | 5856490 |
| 9 | 29993573 |
| 10 | 152063662 |
| 11 | 764940884 |
| 12 | 3828258995 |
| 13 | 19086321346 |
| 14 | 94907855054 |
| 15 | 471032090907 |
| 16 | 2334592278836 |
| 17 | 11559687446670 |
| 18 | 57197509727715 |
| 19 | 282871139080418 |
| 20 | 1398435823681688 |