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) |
|---|---|
| 7 | 1 |
| 8 | 9 |
| 9 | 63 |
| 10 | 419 |
| 11 | 2868 |
| 12 | 20932 |
| 13 | 165662 |
| 14 | 1432746 |
| 15 | 13578086 |
| 16 | 140951642 |
| 17 | 1598792812 |
| 18 | 19739303596 |
| 19 | 264041415799 |
| 20 | 3807692229035 |
| 21 | 58907522237037 |
| 22 | 973166134330293 |
| 23 | 17094936849558000 |
| 24 | 318092941562300736 |
| 25 | 6248389843759774380 |
| 26 | 129180041710223480596 |
| 27 | 2803277432655658573548 |