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 | 2 |
| 2 | 14 |
| 3 | 98 |
| 4 | 686 |
| 5 | 4802 |
| 6 | 33614 |
| 7 | 235298 |
| 8 | 1647086 |
| 9 | 11529602 |
| 10 | 80707214 |
| 11 | 564950498 |
| 12 | 3954653486 |
| 13 | 27682574402 |
| 14 | 193778020814 |
| 15 | 1356446145698 |
| 16 | 9495123019886 |
| 17 | 66465861139202 |
| 18 | 465261027974414 |
| 19 | 3256827195820898 |
| 20 | 22797790370746286 |
| 21 | 159584532595224002 |
| 22 | 1117091728166568014 |