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) |
|---|---|
| 2 | 1 |
| 3 | 7 |
| 4 | 92 |
| 5 | 591 |
| 6 | 2683 |
| 7 | 9955 |
| 8 | 32551 |
| 9 | 98086 |
| 10 | 280271 |
| 11 | 773906 |
| 12 | 2091266 |
| 13 | 5576298 |
| 14 | 14750858 |
| 15 | 38839257 |
| 16 | 101995694 |
| 17 | 267462041 |
| 18 | 700813797 |
| 19 | 1835540197 |
| 20 | 4806538617 |
| 21 | 12585017712 |
| 22 | 32949712457 |
| 23 | 86265626164 |
| 24 | 225849041524 |
| 25 | 591283811748 |
| 26 | 1548005222980 |
| 27 | 4052735290427 |
| 28 | 10610204784368 |