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) |
|---|---|
| 0 | 2 |
| 1 | 16 |
| 2 | 130 |
| 3 | 1072 |
| 4 | 8962 |
| 5 | 75856 |
| 6 | 649090 |
| 7 | 5606512 |
| 8 | 48811522 |
| 9 | 427774096 |
| 10 | 3769259650 |
| 11 | 33358386352 |
| 12 | 296270823682 |
| 13 | 2638754838736 |
| 14 | 23555015527810 |
| 15 | 210638693604592 |
| 16 | 1886253119421442 |
| 17 | 16909812213653776 |
| 18 | 151723048894909570 |