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 | 3 |
| 2 | 155 |
| 3 | 11914 |
| 4 | 728857 |
| 5 | 42238426 |
| 6 | 2492016728 |
| 7 | 147382229321 |
| 8 | 8704392890599 |
| 9 | 514207059584879 |
| 10 | 30367424047335204 |
| 11 | 1793195869965086337 |
| 12 | 105893252956708204722 |
| 13 | 6253339527216096201144 |
| 14 | 369279138864066223011929 |
| 15 | 21807048314051213226593407 |