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 | 7 |
| 1 | 47 |
| 2 | 323 |
| 3 | 2213 |
| 4 | 15169 |
| 5 | 103969 |
| 6 | 712615 |
| 7 | 4884335 |
| 8 | 33477731 |
| 9 | 229459781 |
| 10 | 1572740737 |
| 11 | 10779725377 |
| 12 | 73885336903 |
| 13 | 506417632943 |
| 14 | 3471038093699 |
| 15 | 23790849022949 |
| 16 | 163064905066945 |
| 17 | 1117663486445665 |
| 18 | 7660579500052711 |