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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 61 |
| 6 | 196 |
| 7 | 629 |
| 8 | 2017 |
| 9 | 6466 |
| 10 | 20727 |
| 11 | 66441 |
| 12 | 212980 |
| 13 | 682721 |
| 14 | 2188509 |
| 15 | 7015418 |
| 16 | 22488411 |
| 17 | 72088165 |
| 18 | 231083620 |
| 19 | 740754589 |
| 20 | 2374540265 |
| 21 | 7611753682 |
| 22 | 24400004911 |
| 23 | 78215909841 |
| 24 | 250726529556 |
| 25 | 803721298537 |
| 26 | 2576384425157 |
| 27 | 8258779154250 |
| 28 | 26474089989299 |