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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 53 |
| 6 | 496 |
| 7 | 81096 |
| 8 | 35292601 |
| 9 | 211275732504203 |
| 10 | 5013078952131335869356 |
| 11 | 4188494841905497365271738826910705731652978 |
| 12 | 13998172580873019733546655911268420464183123192214609601699428961 |