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 | 3 |
| 3 | 10 |
| 4 | 36 |
| 5 | 131 |
| 6 | 476 |
| 7 | 1728 |
| 8 | 6272 |
| 9 | 22765 |
| 10 | 82629 |
| 11 | 299915 |
| 12 | 1088589 |
| 13 | 3951206 |
| 14 | 14341527 |
| 15 | 52054840 |
| 16 | 188941273 |
| 17 | 685792227 |
| 18 | 2489191330 |
| 19 | 9034913540 |
| 20 | 32793647355 |
| 21 | 119029728628 |
| 22 | 432037221840 |
| 23 | 1568147413312 |
| 24 | 5691839002677 |
| 25 | 20659429692245 |
| 26 | 74986666876571 |
| 27 | 272175964826781 |