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 | 2 |
| 2 | 54 |
| 3 | 812 |
| 4 | 8580 |
| 5 | 70310 |
| 6 | 472626 |
| 7 | 2703512 |
| 8 | 13507416 |
| 9 | 60110030 |
| 10 | 241925530 |
| 11 | 891454124 |
| 12 | 3037849828 |
| 13 | 9654482474 |
| 14 | 28818500830 |
| 15 | 81289041680 |
| 16 | 217815522736 |
| 17 | 556959705302 |
| 18 | 1364497268946 |
| 19 | 3214138597460 |
| 20 | 7302195414780 |
| 21 | 16045139112002 |
| 22 | 34183012888134 |
| 23 | 70764981877592 |