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 | 7 |
| 9 | 55 |
| 10 | 319 |
| 11 | 1705 |
| 12 | 8238 |
| 13 | 37674 |
| 14 | 164229 |
| 15 | 692627 |
| 16 | 2843282 |
| 17 | 11433826 |
| 18 | 45212792 |
| 19 | 176385132 |
| 20 | 680452948 |
| 21 | 2600725892 |
| 22 | 9862321095 |
| 23 | 37150333241 |
| 24 | 139139984973 |
| 25 | 518538211261 |
| 26 | 1924077739700 |
| 27 | 7112221384554 |
| 28 | 26201080984497 |
| 29 | 96233327019085 |
| 30 | 352501632479306 |