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 | 0 |
| 2 | 3 |
| 3 | 8 |
| 4 | 37 |
| 5 | 166 |
| 6 | 828 |
| 7 | 4238 |
| 8 | 22563 |
| 9 | 122986 |
| 10 | 684809 |
| 11 | 3877416 |
| 12 | 22270064 |
| 13 | 129457176 |
| 14 | 760412390 |
| 15 | 4507076156 |
| 16 | 26926958097 |
| 17 | 162005104664 |
| 18 | 980816681009 |
| 19 | 5971509956366 |
| 20 | 36540846282249 |
| 21 | 224628865150116 |
| 22 | 1386650559443616 |