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 | 3 |
| 2 | 28 |
| 3 | 146 |
| 4 | 627 |
| 5 | 2471 |
| 6 | 9292 |
| 7 | 33878 |
| 8 | 120771 |
| 9 | 423251 |
| 10 | 1463908 |
| 11 | 5011690 |
| 12 | 17021179 |
| 13 | 57450167 |
| 14 | 192966908 |
| 15 | 645696454 |
| 16 | 2154226075 |
| 17 | 7170606795 |
| 18 | 23825657596 |
| 19 | 79055534746 |
| 20 | 262031761435 |
| 21 | 867792229799 |
| 22 | 2872103661988 |
| 23 | 9501035284286 |
| 24 | 31417942222787 |
| 25 | 103862506390523 |
| 26 | 343276150243020 |