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 | 2 |
| 2 | 7 |
| 3 | 17 |
| 4 | 57 |
| 5 | 177 |
| 6 | 577 |
| 7 | 1857 |
| 8 | 6017 |
| 9 | 19457 |
| 10 | 62977 |
| 11 | 203777 |
| 12 | 659457 |
| 13 | 2134017 |
| 14 | 6905857 |
| 15 | 22347777 |
| 16 | 72318977 |
| 17 | 234029057 |
| 18 | 757334017 |
| 19 | 2450784257 |
| 20 | 7930904577 |
| 21 | 25664946177 |
| 22 | 83053510657 |
| 23 | 268766806017 |
| 24 | 869747654657 |
| 25 | 2814562533377 |
| 26 | 9108115685377 |
| 27 | 29474481504257 |