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 | 4 |
| 2 | 12 |
| 3 | 33 |
| 4 | 90 |
| 5 | 244 |
| 6 | 665 |
| 7 | 1808 |
| 8 | 4914 |
| 9 | 13359 |
| 10 | 36315 |
| 11 | 98715 |
| 12 | 268337 |
| 13 | 729416 |
| 14 | 1982759 |
| 15 | 5389698 |
| 16 | 14650719 |
| 17 | 39824784 |
| 18 | 108254987 |
| 19 | 294267566 |
| 20 | 799902177 |
| 21 | 2174359553 |
| 22 | 5910522063 |
| 23 | 16066464720 |
| 24 | 43673179097 |
| 25 | 118716009132 |
| 26 | 322703570371 |