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 | 0 |
| 2 | 1 |
| 3 | 27 |
| 4 | 257 |
| 5 | 1625 |
| 6 | 6508 |
| 7 | 24010 |
| 8 | 65793 |
| 9 | 177174 |
| 10 | 391626 |
| 11 | 893101 |
| 12 | 1665644 |
| 13 | 3398759 |
| 14 | 5786411 |
| 15 | 10531652 |
| 16 | 16843009 |
| 17 | 29065308 |
| 18 | 42698935 |
| 19 | 70764303 |
| 20 | 100231882 |
| 21 | 155608837 |
| 22 | 215237342 |
| 23 | 326294606 |
| 24 | 426404460 |
| 25 | 634767250 |
| 26 | 819100920 |
| 27 | 1162438641 |
| 28 | 1480961067 |
| 29 | 2084357107 |
| 30 | 2538128133 |