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 | 0 |
| 1 | 3 |
| 2 | 27 |
| 3 | 219 |
| 4 | 1755 |
| 5 | 14043 |
| 6 | 112347 |
| 7 | 898779 |
| 8 | 7190235 |
| 9 | 57521883 |
| 10 | 460175067 |
| 11 | 3681400539 |
| 12 | 29451204315 |
| 13 | 235609634523 |
| 14 | 1884877076187 |
| 15 | 15079016609499 |
| 16 | 120632132875995 |
| 17 | 965057063007963 |
| 18 | 7720456504063707 |
| 19 | 61763652032509659 |