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 | 8 |
| 2 | 35 |
| 3 | 153 |
| 4 | 706 |
| 5 | 3479 |
| 6 | 18313 |
| 7 | 102678 |
| 8 | 610989 |
| 9 | 3844525 |
| 10 | 25492752 |
| 11 | 177579961 |
| 12 | 1295811637 |
| 13 | 9879799744 |
| 14 | 78525094847 |
| 15 | 649253421173 |
| 16 | 5573667453498 |
| 17 | 49595062947091 |
| 18 | 456689512735421 |
| 19 | 4345710521536150 |
| 20 | 42675672248378721 |
| 21 | 431963852263306569 |
| 22 | 4501627598926298992 |