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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 27 |
| 7 | 67 |
| 8 | 180 |
| 9 | 528 |
| 10 | 1676 |
| 11 | 5721 |
| 12 | 20924 |
| 13 | 81634 |
| 14 | 338322 |
| 15 | 1484209 |
| 16 | 6870492 |
| 17 | 33460830 |
| 18 | 170997842 |
| 19 | 914764494 |
| 20 | 5111445917 |
| 21 | 29773148141 |
| 22 | 180449216699 |
| 23 | 1136060712131 |
| 24 | 7418026238304 |
| 25 | 50163775035664 |