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 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 36 |
| 7 | 94 |
| 8 | 256 |
| 9 | 729 |
| 10 | 2154 |
| 11 | 6583 |
| 12 | 20736 |
| 13 | 67156 |
| 14 | 223150 |
| 15 | 759375 |
| 16 | 2642246 |
| 17 | 9387369 |
| 18 | 34012224 |
| 19 | 125537306 |
| 20 | 471556032 |
| 21 | 1801088541 |
| 22 | 6989288907 |
| 23 | 27536796143 |
| 24 | 110075314176 |
| 25 | 446169698824 |
| 26 | 1832746290156 |
| 27 | 7625597484987 |
| 28 | 32122422687591 |