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 | 13 |
| 2 | 169 |
| 3 | 493 |
| 4 | 1664 |
| 5 | 6552 |
| 6 | 21547 |
| 7 | 67330 |
| 8 | 217902 |
| 9 | 687672 |
| 10 | 2108870 |
| 11 | 6459569 |
| 12 | 19653779 |
| 13 | 59068262 |
| 14 | 176517135 |
| 15 | 525307673 |
| 16 | 1554420841 |
| 17 | 4579979219 |
| 18 | 13453583712 |
| 19 | 39397940890 |
| 20 | 115063670433 |
| 21 | 335345658200 |
| 22 | 975522972020 |
| 23 | 2833090734366 |