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 | 10 |
| 3 | 32 |
| 4 | 99 |
| 5 | 301 |
| 6 | 908 |
| 7 | 2730 |
| 8 | 8197 |
| 9 | 24599 |
| 10 | 73806 |
| 11 | 221428 |
| 12 | 664295 |
| 13 | 1992897 |
| 14 | 5978704 |
| 15 | 17936126 |
| 16 | 53808393 |
| 17 | 161425195 |
| 18 | 484275602 |
| 19 | 1452826824 |
| 20 | 4358480491 |
| 21 | 13075441493 |
| 22 | 39226324500 |
| 23 | 117678973522 |
| 24 | 353036920589 |
| 25 | 1059110761791 |
| 26 | 3177332285398 |
| 27 | 9531996856220 |
| 28 | 28595990568687 |
| 29 | 85787971706089 |
| 30 | 257363915118296 |