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 | 3 |
| 1 | 11 |
| 2 | 37 |
| 3 | 127 |
| 4 | 433 |
| 5 | 1479 |
| 6 | 5049 |
| 7 | 17239 |
| 8 | 58857 |
| 9 | 200951 |
| 10 | 686089 |
| 11 | 2342455 |
| 12 | 7997641 |
| 13 | 27305655 |
| 14 | 93227337 |
| 15 | 318298039 |
| 16 | 1086737481 |
| 17 | 3710353847 |
| 18 | 12667940425 |
| 19 | 43251054007 |
| 20 | 147668335177 |
| 21 | 504171232695 |
| 22 | 1721348260425 |
| 23 | 5877050576311 |
| 24 | 20065505784393 |
| 25 | 68507921984951 |