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 | 11 |
| 2 | 73 |
| 3 | 467 |
| 4 | 3025 |
| 5 | 19931 |
| 6 | 133273 |
| 7 | 901667 |
| 8 | 6155425 |
| 9 | 42306731 |
| 10 | 292240873 |
| 11 | 2026154867 |
| 12 | 14085427825 |
| 13 | 98109713531 |
| 14 | 684326588473 |
| 15 | 4778079088067 |
| 16 | 33385518460225 |
| 17 | 233393453440331 |
| 18 | 1632228295176073 |
| 19 | 11417968671701267 |