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 | 5 |
| 2 | 27 |
| 3 | 159 |
| 4 | 1029 |
| 5 | 7353 |
| 6 | 58095 |
| 7 | 506691 |
| 8 | 4860297 |
| 9 | 51023277 |
| 10 | 583097859 |
| 11 | 7215769575 |
| 12 | 96210083853 |
| 13 | 1375803720801 |
| 14 | 21012273704151 |
| 15 | 341449444105227 |
| 16 | 5883436565417745 |
| 17 | 107162594556721749 |
| 18 | 2057521815411573483 |