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 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 30 |
| 5 | 91 |
| 6 | 303 |
| 7 | 936 |
| 8 | 2936 |
| 9 | 9300 |
| 10 | 29209 |
| 11 | 91917 |
| 12 | 289547 |
| 13 | 911218 |
| 14 | 2868341 |
| 15 | 9029949 |
| 16 | 28424456 |
| 17 | 89477119 |
| 18 | 281667368 |
| 19 | 886657081 |
| 20 | 2791106585 |
| 21 | 8786130132 |
| 22 | 27657838272 |
| 23 | 87064082194 |
| 24 | 274068969337 |
| 25 | 862741399379 |
| 26 | 2715822822365 |
| 27 | 8549136143060 |
| 28 | 26911817257385 |