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 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 37 |
| 4 | 119 |
| 5 | 373 |
| 6 | 1151 |
| 7 | 3517 |
| 8 | 10679 |
| 9 | 32293 |
| 10 | 97391 |
| 11 | 293197 |
| 12 | 881639 |
| 13 | 2649013 |
| 14 | 7955231 |
| 15 | 23882077 |
| 16 | 71678999 |
| 17 | 215102533 |
| 18 | 645438671 |
| 19 | 1936578157 |
| 20 | 5810258759 |
| 21 | 17431824853 |
| 22 | 52297571711 |
| 23 | 156896909437 |
| 24 | 470699116919 |
| 25 | 1412114127973 |