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 | 2 |
| 1 | 12 |
| 2 | 74 |
| 3 | 468 |
| 4 | 3026 |
| 5 | 19932 |
| 6 | 133274 |
| 7 | 901668 |
| 8 | 6155426 |
| 9 | 42306732 |
| 10 | 292240874 |
| 11 | 2026154868 |
| 12 | 14085427826 |
| 13 | 98109713532 |
| 14 | 684326588474 |
| 15 | 4778079088068 |
| 16 | 33385518460226 |
| 17 | 233393453440332 |
| 18 | 1632228295176074 |
| 19 | 11417968671701268 |