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 | 2 |
| 4 | 12 |
| 5 | 13 |
| 6 | 90 |
| 7 | 121 |
| 8 | 3457 |
| 9 | 7372 |
| 10 | 42530 |
| 11 | 147081 |
| 12 | 348753 |
| 13 | 1185480 |
| 14 | 17262610 |
| 15 | 28408922 |
| 16 | 87175278 |
| 17 | 120293961 |
| 18 | 344697955 |
| 19 | 634418862 |
| 20 | 3889219736 |
| 21 | 8965899278 |
| 22 | 9695659687 |
| 23 | 18962955420 |
| 24 | 27004920068 |
| 25 | 67070581522 |