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 | 2047 |
| 2 | 175099 |
| 3 | 4017157 |
| 4 | 44633821 |
| 5 | 313968931 |
| 6 | 1614529687 |
| 7 | 6612607849 |
| 8 | 22791125017 |
| 9 | 68618940391 |
| 10 | 185311670611 |
| 11 | 457696700077 |
| 12 | 1049152023349 |
| 13 | 2257404775627 |
| 14 | 4600190689711 |
| 15 | 8942430185041 |
| 16 | 16679710263217 |
| 17 | 29996513771599 |
| 18 | 52221848818987 |
| 19 | 88309741101781 |