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 | 27 |
| 2 | 325 |
| 3 | 7607 |
| 4 | 69649 |
| 5 | 1749419 |
| 6 | 22103317 |
| 7 | 476952263 |
| 8 | 4311744769 |
| 9 | 116417108763 |
| 10 | 1392727114821 |
| 11 | 32619053820599 |
| 12 | 300171238899985 |
| 13 | 7506480532757163 |
| 14 | 94597931458646037 |
| 15 | 2049660569696039367 |