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 | 16 |
| 3 | 41 |
| 4 | 121 |
| 5 | 316 |
| 6 | 841 |
| 7 | 2201 |
| 8 | 5776 |
| 9 | 15121 |
| 10 | 39601 |
| 11 | 103676 |
| 12 | 271441 |
| 13 | 710641 |
| 14 | 1860496 |
| 15 | 4870841 |
| 16 | 12752041 |
| 17 | 33385276 |
| 18 | 87403801 |
| 19 | 228826121 |
| 20 | 599074576 |
| 21 | 1568397601 |
| 22 | 4106118241 |
| 23 | 10749957116 |
| 24 | 28143753121 |
| 25 | 73681302241 |
| 26 | 192900153616 |
| 27 | 505019158601 |
| 28 | 1322157322201 |