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 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 11 |
| 8 | 75 |
| 9 | 171 |
| 10 | 172 |
| 11 | 384 |
| 12 | 457 |
| 13 | 616 |
| 14 | 643 |
| 15 | 1391 |
| 16 | 1613 |
| 17 | 2122 |
| 18 | 2647 |
| 19 | 2673 |
| 20 | 4413 |
| 21 | 13494 |
| 22 | 31260 |
| 23 | 33237 |
| 24 | 304723 |
| 25 | 365071 |
| 26 | 436504 |
| 27 | 498865 |
| 28 | 637491 |