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 | 24 |
| 2 | 98 |
| 3 | 504 |
| 4 | 3074 |
| 5 | 19992 |
| 6 | 133346 |
| 7 | 901752 |
| 8 | 6155522 |
| 9 | 42306840 |
| 10 | 292240994 |
| 11 | 2026155000 |
| 12 | 14085427970 |
| 13 | 98109713688 |
| 14 | 684326588642 |
| 15 | 4778079088248 |
| 16 | 33385518460418 |
| 17 | 233393453440536 |
| 18 | 1632228295176290 |
| 19 | 11417968671701496 |