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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 119 |
| 3 | 3955 |
| 4 | 247093 |
| 5 | 29355725 |
| 6 | 6770018269 |
| 7 | 3075928905505 |
| 8 | 2774997766597238 |
| 9 | 4989660046676105752 |
| 10 | 17913062958150482828608 |
| 11 | 128508635121001835101510976 |
| 12 | 1843071985575998120371392747776 |
| 13 | 52855626540938653363337299348546560 |
| 14 | 3031270298538159379928340759759663584000 |