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 | 13 |
| 2 | 169 |
| 3 | 1153 |
| 4 | 7675 |
| 5 | 55063 |
| 6 | 397221 |
| 7 | 2841311 |
| 8 | 20294131 |
| 9 | 145066667 |
| 10 | 1037297447 |
| 11 | 7416956341 |
| 12 | 53030329081 |
| 13 | 379156174051 |
| 14 | 2710908891177 |
| 15 | 19382663085405 |
| 16 | 138583595369137 |
| 17 | 990854370992397 |
| 18 | 7084476762966115 |
| 19 | 50653072024038803 |