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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 18 |
| 6 | 36 |
| 7 | 78 |
| 8 | 191 |
| 9 | 6456 |
| 10 | 6457 |
| 11 | 40080 |
| 12 | 40081 |
| 13 | 637324 |
| 14 | 637326 |
| 15 | 637344 |
| 16 | 10553425 |
| 17 | 10553434 |
| 18 | 10553477 |
| 19 | 10553502 |
| 20 | 10553573 |
| 21 | 10553854 |
| 22 | 27066988 |
| 23 | 27067126 |
| 24 | 69709680 |
| 25 | 69709736 |
| 26 | 69709940 |
| 27 | 465769818 |
| 28 | 3140421716 |
| 29 | 3140421740 |
| 30 | 3140421743 |