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 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 41 |
| 5 | 206 |
| 6 | 1150 |
| 7 | 7023 |
| 8 | 46279 |
| 9 | 325845 |
| 10 | 2432608 |
| 11 | 19138508 |
| 12 | 157893016 |
| 13 | 1360356046 |
| 14 | 12197663221 |
| 15 | 113489506443 |
| 16 | 1092914231524 |
| 17 | 10869407462093 |
| 18 | 111421588497433 |
| 19 | 1175241503062627 |
| 20 | 12735340966302227 |
| 21 | 141585732942425447 |
| 22 | 1612917155538690101 |